1.26-5m=2-9 2.9z+11=13z-1
-5m+9m=2-26. 9z-13z=-1-11
4m=-24. -4z=-12
m=-24:4 z=-12:(-4)
m=-6 z=3
3.12a+31=23a-2.
12a-23a=-2-31
-11a=-33
a=-33:(-11)
a=3
4.2(x-2)-1=5(x-2)-7. 5.-y+20=y
2(x-2)-5(x-2)=-7+1. -y- y=-20
(2-5)*(x-2)=-7+1. 2y=-20
-3*(x-2)=-7+1. y=20:2
x=2+2 y=10
x=5