Решите 5 уравнений 1+7(х-2)=5(3-2х)+3 9-6(7-5х)=8+2(х-4) 9/10Х=-5 9х-69-2+х)=-7*9+20...

Question

Решите 5 уравнений
1+7(х-2)=5(3-2х)+3
9-6(7-5х)=8+2(х-4)
9/10Х=-5
9х-69-2+х)=-7*9+20
-3(6х+2)-1=4(х-3)-9

Answer 1

1+7(х-2)=5(3-2х)+3
1 + 7х - 14 = 15 - 10х + 3
7х + 10х = 15 + 3 - 1 + 14
17х = 31
х = 31/17 = 1 14/17

9 - 6 (7 - 5х) = 8 + 2 (х - 4)
9 - 42 + 30х = 8 + 2х - 8
30х - 2х = 8 - 8 - 9 + 42
28х = 33
х = 33/28 = 1 5/28

9/10 х = - 5
х = -5 : 9/10
х = - 50/9 = - 5 5/9

-3 (6х + 2) - 1 = 4 (х - 3) - 9
- 18х - 6 - 1 = 4х - 12 - 9
-18х - 4х = -12 - 9 + 6 + 1
-22х = - 14
х = -14 : (-22)
х = 14/22 = 7/11