Resposta :
Resposta:
a) 4x + 5 = x + 20
4x - x = 20 - 5
3x = 15
x = 15/3
x = 5
b) 3(x + 1) + 2(2x - 3) = 5(x - 1) + 8
3x + 3 + 4x - 6 = 5x - 5 + 8
7x - 3 = 5x + 3
7x - 5x = 3 + 3
2x = 6
x = 6/2
x = 3
Resposta:
a) 4x + 5 = x + 20
4x - x = 20 - 5
3x = 15
x = 15/3
x = 5
b) 3(x + 1) + 2(2x - 3) = 5(x - 1) + 8
3x + 3 + 4x - 6 = 5x - 5 + 8
7x - 3 = 5x + 3
7x - 5x = 3 + 3
2x = 6
x = 6/2
x = 3