Question

Решите уравнение: а) -4•(-z+7)=z+17 б) 3•(2x-5)+4x=5•(x-3)+27

Answer 1

1) -4*(-z+7) = z+17
-4z - 28 = z + 17
3z = 45
z = 15
2) 3*(2x-5)+4x=5*(x-3)+27
6x -15 + 4x = 5x - 15 +27
6x + 4x - 5x = -15 + 27 + 15
5x = 27
x = 5,4