Question

determine o valor de x:
5(x + 1) + 6(x + 2) = 9(x + 3)

Answer 1

5(x+1)+6(x+2)=9(x+3)

5x+5+6x+12=9x+27

5x+6x-9x=27-5-12

2x=10

x=5

Answer 2

Tirando os parenteses e multiplicando, temos:
5x+5+6x+12=9x+27
5x+6x-9x=27-5-12
11x-9x=10
2x=10
x=10/2
x=5