Решите уравнения

z + 4 - 3 = 2z

7 - 3z + 4z - 9 = 0

10x - 3 + 5 = x + 3x

3x - 2 = 5x + 10

1) 2z = z + 4 -3
z = 1
2) z = 16
3) 6x + 2 = 0;
6x = -2
x = -2 / 6 = - 1 / 3
4) -2x = 12
2x = -12
x = -6