Resposta:

s) 92; t) 4; u) -2; v) 1; w) 6; x) -11/4; y) 3; z) 4.

Explicação passo a passo:

s) 2 - x/5 = - 18

2 - x = 90

- x = 90 - 2

- x = - 92  .(-1)

x = 92.

t) 2x + 16 = 6x

2x - 6x = - 16

- 4x = - 16  .(-1)

4x = 16

x = 16 : 4

x = 4.

u) 2 - x - 5 = x + 1

- x - x = 1 - 2 + 5

- 2x = - 1 + 5

- 2x = 4  .(-1)

2x = - 4

x = - 4 : 2

x = - 2.

v) 2x + 3 = x + 4

2x - x = 4 - 3

x = 1.

w) 4x - 10 = 2x + 2

4x - 2x = 2 + 10

2x = 12

x = 12 : 2

x = 6.

x) 4(x + 3) = 1

4x + 12 = 1

4x = 1 - 12

4x = - 11

x = - 11/4.

y) 5x + 7 = 4x + 10

5x - 4x = 10 - 7

x = 3.

z) 7x - 2 + 4 = 10 + 5x

7x - 5x = 10 + 2 - 4

2x = 12 - 4

2x = 8

x = 8 : 2

x = 4.