Question

Решите уравнения
1)5х+11=7х+31
2)(12х+11)-8=13х-7
3)10(8х-3)=140+7(3х+1)
4)48=11-(9х+2)

Answer 1

1)5х+11=7х+31
5х-7х=31-11
-2х=20
х=-10

2)(12х+11)-8=13х-7
12х-13х=-7-11+8
-х=-10
х=10

3)10(8х-3)=140+7(3х+1)
80х-30=140+21х+7
80х-21х=140+7+30
59х=177
х=3

4)48=11-(9х+2)
48=11-9х-2
9х=11-2-48
9х=-39
х=-39/9
х=-4,3/9
х=-4⅓

Answer 2

1.

5х + 11 = 7х + 31

5х - 7х = 31 - 11

-2х = 20

х = -10

2.

(12х + 11) - 8 = 13х - 7

12х + 11 - 8 = 13х - 7

12х - 13х = -7 - 11 + 8

-х = -10

х = 10

3.

10(8х - 3) = 140 + 7(3х + 1)

80х - 30 = 140 + 21х + 7

80х - 21х = 140 + 7 + 30

59х = 177

х = 3

4.

48 = 11 - (9х + 2)

48 = 11 - 9х  - 2

48 = 9 - 9х

9х = 9 - 48

9х = - 39

х = $-\frac{13}{3}$