Решите уравнение
1)6m-19=3m+8
2)10x+4=5x+19
3)7m-1=9m+4
4)8m+7=13m+12
5)-9x+8=x=14
6)21y-5=20y-12

Пошаговое объяснение:

1) 6m – 19 = 3m + 8

6m – 3m =8 + 19

3m = 27

m = 27 : 3

m = 9

2) 10x + 4 = 5x + 19

10x - 5x = 19 – 4

5x = 15

x = 15 : 5

x = 3

3) 7m – 1 = 9m + 4

7m – 9m = 4 +1

-2m = 5

m = 5 : (-2)

m = -2,5

4) 8m + 7 = 13m + 12

8m – 13m = 12 – 7

-5m = 5

m = 5 : (-5)

m = -1

5) -9x + 8 = x – 14

-9x - х = -14 – 8

-10х = -22

х = -22 : (-10)

х = 2,2

6) 21y – 5 = 20y - 12

21у – 20у = 5 – 12

у = -7