Question

resolva as questões à seguir

Answer 1

a) x * 4 = (-8) * (-9)
4x = 72
x = 72/4
x = 18

b) x * [(8 -7)] = -5
x = -5

c) 5 * (x-7) = -40
5x -35 = -40
5x = -40 + 35
5x = -5
x = -1