Question

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Answer 1

Resposta:

2) 2x - 20 = 100

2x = 100 + 20

2x = 120

x = $\frac{120}{2}$

x = 60

3) 3x + 2x = 600

5x = 600

x = $\frac{600}{5}$

x = 120

4) 2x + 15 = 49

2x = 49 - 15

2x = 34

x = $\frac{34}{2}$

x = 17

5) 4x - 10 = 2x + 2

4x - 2x = 2 + 10

2x = 12

x = $\frac{12}{2}$

x = 6

6) 2x - 10 = $\frac{x}{2}$ - 50

$\frac{4x - 20}{2} = \frac{x - 100}{2}$

4x - 20 = x - 100

4x - x = - 100 + 20

3x = - 80

x = $\frac{-80}{3}$

x = 26, 6...

7) 3x - $\frac{x}{2}$ = 35

$\frac{6x - x}{2} = \frac{70}{2}$

6x -x = 70

5x = 70

x = 70/5

x = 14

Explicação passo a passo: