Question

5-(-x-7,2)=8,6 9,3+(3,1-y)=12,2 3*(x-2)-5=4 5*(4-2x)-4*(7-4x)=1,3

Answer 1

5-(-x-7,2)=8,6
5+х+7,2=8,6
Х=8,6-7,2-5
Х=-3,6

9,3+(3,1-y)=12,2
9,3+3,1-у=12,2
-у=12,2-3,1-9,3
-у=-0, 2
У=0,2

3*(x-2)-5=4
3х-6-5=4
3х=4+5+6
3х=15
Х=15:3
Х=5

5*(4-2x)-4*(7-4x)=1,3
20-10х-28+16х=1,3
16х-10х=1,3+28-20
6х=9,3
Х=9,3:6
Х=1,55

Answer 2

To solve these equations, let's go through each one step by step:

1. 5 - (-x - 7) = 8.6 Start by simplifying the expression inside the brackets: 5 - (-x - 7) = 8.6 5 + x + 7 = 8.6 Combine like terms: x + 12 = 8.6 Now, isolate x on one side of the equation by subtracting 12 from both sides: x = 8.6 - 12 x = -3.4

2. 9.3 + (3.1 - y) = 12.2 Start by simplifying the expression inside the brackets: 9.3 + (3.1 - y) = 12.2 9.3 + 3.1 - y = 12.2 Combine like terms: 12.4 - y = 12.2 Now, isolate y on one side of the equation by subtracting 12.4 from both sides: -y = 12.2 - 12.4 -y = -0.2 Finally, multiply both sides by -1 to solve for y: y = 0.2

3. 3 * (x - 2) - 5 = 4 Distribute the multiplication: 3x - 6 - 5 = 4 Combine like terms: 3x - 11 = 4 Now, isolate x on one side of the equation by adding 11 to both sides: 3x = 4 + 11 3x = 15 Finally, divide both sides by 3 to solve for x: x = 15 / 3 x = 5

4. 5 * (4 - 2x) - 4 * (7 - 4x) = 1.3 Distribute the multiplication: 20 - 10x - 28 + 16x = 1.3 Combine like terms: -10x + 16x - 8 = 1.3 6x - 8 = 1.3 Now, isolate x on one side of the equation by adding 8 to both sides: 6x = 1.3 + 8 6x = 9.3 Finally, divide both sides by 6 to solve for x: x = 9.3 / 6 x = 1.55

So, the solutions to the given equations are:

1. x = -3.4
2. y = 0.2
3. x = 5
4. x = 1.55