Question

А)7х+11,9=0 б)6х-0,8=3х+2,2 в)4-4(х+3)=4(х-5)

Answer 1

a) 7x+11,9=0

7x= -11,9

x= -1,7

b)6x-0,8=3x+2,2

6x-3x=2,2+0,8

3x=3

x=1

Answer 2

В) 4-4х-12=4х-20
-4х-8=4х-20
-4х-4х=-20+8
-8х=-12|:(-8)
х=12/8
х= 1 (целая) 4/8
х= 1 (целая) 1/2

Answer 3

To solve each of the equations, we'll isolate the variable (x) on one side of the equation. Let's go through each one step by step:

А) 7x + 11.9 = 0

Step 1: Move 11.9 to the other side by subtracting it from both sides of the equation: 7x + 11.9 - 11.9 = 0 - 11.9 7x = -11.9

Step 2: Now, isolate x by dividing both sides by 7: x = -11.9 / 7 x = -1.7

So the solution is x = -1.7.

B) 6x - 0.8 = 3x + 2.2

Step 1: Move 3x to the left side by subtracting it from both sides of the equation: 6x - 3x - 0.8 = 3x - 3x + 2.2 3x - 0.8 = 2.2

Step 2: Move -0.8 to the right side by adding 0.8 to both sides of the equation: 3x - 0.8 + 0.8 = 2.2 + 0.8 3x = 3

Step 3: Now, isolate x by dividing both sides by 3: x = 3 / 3 x = 1

So the solution is x = 1.

C) 4 - 4(x + 3) = 4(x - 5)

Step 1: Distribute the 4 on the left side: 4 - 4x - 12 = 4(x - 5)

Step 2: Combine like terms on the left side: -4x - 8 = 4(x - 5)

Step 3: Distribute the 4 on the right side: -4x - 8 = 4x - 20

Step 4: Move 4x to the left side by subtracting it from both sides of the equation: -4x - 4x - 8 = 4x - 4x - 20 -8x - 8 = -20

Step 5: Move -8 to the right side by adding 8 to both sides of the equation: -8x - 8 + 8 = -20 + 8 -8x = -12

Step 6: Now, isolate x by dividing both sides by -8: x = -12 / -8 x = 1.5

So the solution is x = 1.5.