Question

calcule o valor de x:​

Answer 1

RESPOSTAS E CÁLCULOS.

$a) \: \: (5x + 5) + (3x + 13) = 90 \\ 5x + 3x + 13 + 5 = 90 \\ 8x + 18 = 90 \\ 8x = 90 - 18 \\ 8x = 72 \\ x = \frac{72}{2} \\ x = 9$

$b) \: \: (5x - 27) + (x + 15) = 90 \\ 5x + x + 15 - 27 = 90 \\ 6x - 12 = 90 \\ 6x = 90 + 12 \\ 6x = 102 \\ x = \frac{102}{6} \\ x = 17$

$c) \: \: (4x - 6) + 2x = 90 \\ 4x + 2x - 6 = 90 \\ 6x = 90 + 6 \\ x = \frac{96}{6} \\ x = 16$

espero ter lhe ajudado.