№ Уравнение
1 7x + 1 = 15
2 25x - 52 =23
3 6x +11 = 2x - 5
4 10 +22,7x = 4,7x +28
5 8,2 - 3x = 11,7 + 2x
6 5 – (x-2) = 4x +17
7 10x + 2,5 = 12 – (10x – 10,5)
8 87 – 2x = 2(4x+56)
9 3(x + 1 ) + 11 = 34 – 2x
10 4 + 5(2x+1) = 39
11 2x + 8 + x = 13 – x + 19
12 -12(2 – x) = 6x + 48
13 35 – 7(5 - x) = x + 12
14 49x = 270 – (x + 20)
15 -11x +52 = 46x – (48+ 37x)
16 7,2x – 6 = 2,2x + 14
17 3,6 – 1,2x =1,4x – 1,6
18 1,5 + 5,2x = (4,8x – 1) – 6,7
19 850 – 225x = 400
20 159x – 21,87 = 84x + 278,13

Пошаговое объяснение:

№ Уравнение

1 7x + 1 = 15

7х=14

х=2

2 25x - 52 =23

25х=75

х=5

3 6x +11 = 2x - 5

4х=-16

х=-4

4 10 +22,7x = 4,7x +28

18х=18

х=1

5 8,2 - 3x = 11,7 + 2x

-5х=3,5

х=-0,7

6 5 – (x-2) = 4x +17

5-х+2=4х+17

-5х=10

х=-2

7 10x + 2,5 = 12 – (10x – 10,5)

10х+2,5=12-10х+10,5

20х=20

х=1

8 87 – 2x = 2(4x+56)

87-2х=8х+112

-10х=25

х=-2,5

9 3(x + 1 ) + 11 = 34 – 2x

3х+3+11=34-2х

5х=20

х=4

10 4 + 5(2x+1) = 39

4+10х+5=39

10х=30

х=3

11 2x + 8 + x = 13 – x + 19

4х=24

х=6

12 -12(2 – x) = 6x + 48

-24+12х=6х+48

6х=12

х=2

13 35 – 7(5 - x) = x + 12

35-35+7х=х+12

6х=12

х=2

14 49x = 270 – (x + 20)

49х=270-х-20

50х=250

х=5

15 -11x +52 = 46x – (48+ 37x)

-11х+52=46х-48-37х

26х=-100

х=-3,8

16 7,2x – 6 = 2,2x + 14

5х=20

х=4

17 3,6 – 1,2x =1,4x – 1,6

-2,6х=5,2

х=-2

18 1,5 + 5,2x = (4,8x – 1) – 6,7

1,5+5,2х=4,8х-1-6,7

0,4х=-9,2

х=-23

19 850 – 225x = 400

-225х=-450

х=2

20 159x – 21,87 = 84x + 278,13

75х=300

х=4