Question

Me ajudem, por favor

Answer 1

Resposta:

$a + b = 2(c + d) \\ \\ 42 + x + 5 = 2(x - 12 + 18) \\ x + 47 = 2(x + 6) \\ x + 47 = 2x + 12 \\ x - 2x = 12 - 47 \\ - x = - 35 \\ x = 35$

$a = 42 \\ b = x + 5 = 35 + 5 = 40 \\ c = x - 12 = 35 - 12 = 23 \\ d = 18$

$42 + 40 + 23 + 18 = 123$