Resposta :
Resposta:
Boa tarde!
Explicação passo-a-passo:
Vamos lá!
a) 5x - 9 = - x + 9
5x + x = 9 + 9
6x = 18
x = 18/6
x = 3
b) 2(x + 5) = 3(- x + 10)
2x + 10 = - 3x + 30
2x + 3x = 30 - 10
5x = 20
x = 20/5
x = 4
c) - 2(- x - 3) = x + 6
2x + 6 = x + 6
2x - x = 6 - 6
x = 0
d) 2x/3 + x/2 = 1
MMC = 6 (3 * 2 = 6)
2 * 2x + 3 * x = 6
4x + 3x = 6
7x = 6
x = 6/7
e) x/3 - x/4 = x/5 + 1
MMC = 60 (3 * 4 * 5 = 60)
20 * x - 15 * x = 12 * x + 60
20x - 15x - 12x = 60
20x - 27x = 60
-7x = 60
x = - 60/7