Question

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EXERCÍCIOS 2
a) 9x - 2 = 4x + 18
b) 2x - 10 + 7x + 10 = 180
c) 3(x + 1) + 2(2x - 3) = 5 (x-1) + 8
d) 2(x + 5) - 4 = 26​

Answer 1

→ Cálculo :

a) 9x - 2 = 4x + 18

9x - 4x = 18 + 2

5x = 20

x = 20 ÷ 5

x = 4

b) 2x - 10 + 7x + 10 = 180

2x + 7x = 180

9x = 180

x = 180 ÷ 9

x = 20

c) 3(x + 1) + 2(2x - 3) = 5(x - 1) + 8

3x + 3 + 4x - 6 = 5x - 5 + 8

7x + 3 - 6 = 5x - 5 + 8

7x - 3 = 5x - 5 + 8

7x - 3 = 5x + 3

7x - 5x = 3 + 3

2x = 6

x = 6 ÷ 2

x = 3

d) 2(x + 5) - 4 = 26​

2x + 10 - 4 = 26

2x + 6 = 26

2x = 26  - 6

2x = 20

x = 20 ÷ 2

x = 10