A)2(5m-1)+7=2m+13 б)2-(8y+4)=3y-9 в)1-(4m-8)=8m+2 г)10a-5=2-3(1-2a)

А)10m-2+7=2m+3
10m-2m=3+2-7
8m=-2
m=-2:8
m=-0.25

б)2-8y-4=3y-9
-8y-3y=-9-2+4
-11y=-7
y=7:11

1-4m+8=8m+2
-4m-8m=2-1-8
-12m=-9
m=9:12
m=3/4

10a-5=2-3+6a
10a-6a=2-3+5
4a=4
a=1