3(2x-1) + 7 = 5(x-1) + 76x - 3 + 7 = 5x - 5 + 76x + 4 = 5x + 26x - 5x = 2 - 4x = -2
-5(z-7) = 30 - (2z+1)-5z + 35 = 30 - 2z - 1-5z + 35 = 29 - 2z-5z + 2z = 29 - 35-3z = -6z = 2
Ответ: x = -2, z = 2.
3(2x-1) + 7 = 5(x-1) + 7
Решим второе уравнение:6x - 3 + 7 = 5x - 5 + 7
6x + 4 = 5x + 2
6x - 5x = 2 - 4
x = -2
-5(z-7) = 30 - (2z+1)
-5z + 35 = 30 - 2z - 1
-5z + 35 = 29 - 2z
-5z + 2z = 29 - 35
-3z = -6
z = 2
Ответ: x = -2, z = 2.