Resposta :
Resposta:
a) 124
b) 40
c) -7
d) 34
2-a) 16
2-b) -24
2-c) -68/3
2-d) 3
Explicação passo a passo:
a) 2x + 42 = 662 - 3x
5x = 620
x = 124
b) 4x - 90 = x + 30
3x = 120
x = 40
c) x + 20 = 13
x = -7
d) 5x + 17 = 2x + 119
3x = 102
x = 34
2 - a) 4x - 57 = 39 - 2x
6x = 96
x = 16
2 - b) 6x + 87 = x - 33
5x = -120
x = -24
2 - c) 7x - 43 = 10x + 25
-3x = 68
x = -68/3
2 - d) 2x + 22 = 4x + 16
-2x = -6
x = 3