18-4y=7(2-y)+6
1/2(x+10)-3=1/4(12-8x)
5(x-2)+6=3(7-2x)
2,6a-0,2a*(3a-9)=-0,5(2a+6)
Решите

Пошаговое объяснение:

18-4y=7(2-y)+6

18 - 4y = 14 - 7y + 6

18 - 4y = 20 - 7y

7y - 4y = 20 - 18

3y = 2

y = 2/3

1/2(x+10)-3=1/4(12-8x)

0,5x + 5 - 3 = 3 - 2x

0,5x + 2 = 3 - 2x

2x + 0,5x = 3 - 2

2,5x = 1

x = 1 : 2,5

x = 0,4

5(x-2)+6=3(7-2x)

5x - 10 + 6 = 21 - 6x

5x - 4 = 21 - 6x

6x + 5x = 21 + 4

11x = 25

x = 25 : 11

x = 2 3/11

2,6a-0,2*(3a-9)=-0,5(2a+6)

2,6a - 0,6a + 1,8 = -a - 3

2a + 1,8 = -a - 3

2a + a = -3 - 1,8

3a = -4,8

a = -4,8 : 3

a = -1,6