Решите уравнения: 12х+14=5х-7 9-х=10+3х 4-3х=7-9х 2х-4=8х-10 х+5=4+2х 11+х=15+9х -5-11х=-2+7х 5.5-8х=-13х-4.5 20х-12=-10+6х

1) 12х + 14 = 5х - 7. 12х - 5х = - 7 - 14. 7х = - 21, х = - 21/7,  х = - 3,

2) 9 - х = 10 + 3х, - х - 3х = 10 - 9, - 4х = 1, х = - 1/4,

3) 4 - 3х = 7 - 9х, - 3х + 9х = 7 - 4,6х = 3, х = 3/6 = 1/2,

4) 2х - 4 = 8х - 10, 2х - 8х = 4 - 10, - 6х = - 6, х = 1,

5) х + 5 = 4 + 2х, х - 2х = 4 - 5, - х = - 1, х = 1,

6) 11 + х = 15 + 9х, х - 9х = 15 - 11, - 8х = 4, х = - 4/8, х = - 1/2,

7) - 5 - 11х = - 2 + 7х, - 11х - 7х = 5 - 2, - 18х = 3, х = - 3/18, х = - 1/6,

8) 5.5 - 8х = - 13х - 4.5, - 8х + 13х = - 4,5 - 5,5, 5х = - 10, х = - 10/5, х = - 2,

9) 20х - 12 = - 10 + 6х, 20х - 6х = 12 - 10, 14х = 2, х = 2/14, х = 1/7.