Question

1)2,1*(2-15x)=6,3 2)1,2x-3=0.5x-3 3)0.8x+1.4=1.4x-2.6 3-5*(x+1)=6-4x 3*(5-x)+13=4*(3x-8) Спасибо если поможите

Answer 1

1)
3 - 5х + 5 = 6 - 4х
8 - 6 = х
2 = х
х = 2

2) 
15 - 3х + 13 = 12х - 32
28 + 32 = 15х
60 = 15х
х = 4

Answer 2

1. Let's start by simplifying the left side of the equation: 2,1*(2-15x) = 4.2 - 31.5x

Now we can write the equation as: 4.2 - 31.5x = 6.3

To solve for x, we need to isolate it on one side of the equation. We can do this by subtracting 4.2 from both sides: -31.5x = 6.3 - 4.2 -31.5x = 2.1

Finally, we divide both sides by -31.5 to solve for x: x = -2/35

Therefore, the solution is x = -2/35.

2. Let's start by simplifying the left side of the equation: 1.2x - 3 = 0.5x - 3

Now we can write the equation as: 1.2x - 0.5x = 3 - 3

To solve for x, we need to isolate it on one side of the equation. We can do this by adding 3 to both sides: 0.7x = 0

Finally, we divide both sides by 0.7 to solve for x: x = 0

Therefore, the solution is x = 0.

3. Let's start by simplifying the left side of the equation: 0.8x + 1.4 = 1.4x - 2.6

Now we can write the equation as: 0.8x - 1.4x = -2.6 - 1.4

To solve for x, we need to isolate it on one side of the equation. We can do this by adding 1.4 to both sides and then dividing by -0.6: x = (-2.6 - 1.4) / -0.6

Finally, we simplify the expression to get the solution: x = 4

Therefore, the solution is x = 4.

4. Let's start by simplifying the left side of the equation: 3 - 5*(x+1) = 6 - 4x

Now we can write the equation as: 3 - 5x - 5 = 6 - 4x

Simplifying the left side further: -5x - 2 = 6 - 4x

To solve for x, we need to isolate it on one side of the equation. We can do this by adding 4x and 2 to both sides: -x = 8

Finally, we multiply both sides by -1 to solve for x: x = -8

Therefore, the solution is x = -8.

5. Let's start by simplifying the right side of the equation: 3*(5-x) + 13 = 4*(3x-8)

Now we can write the equation as: 15 - 3x + 13 = 12x - 32

Simplifying the left side further: 28 - 3x = 12x - 32

To solve for x, we need to isolate it on one side of the equation. We can do this by adding 3x and 32 to both sides: 15x = 60

Finally, we divide both sides by 15 to solve for x: x = 4

Therefore, the solution is x = 4.