10х-13=2х+26

4у-15=2у+5

18а+3=6а+15

-3х+2=х-6

-10х+20=-4х+10

10x-13=2x+26

8x=26+13

8x=39

x=39/8

x=4.875

4y-15=2y+5

2y=15+5

y=10

18a+3=6a+15

12a=12

a=1

-3x+2=x-6

-4x=-8

x=2

-10x+20=-4x+10

-6x=-10

x=10/6

x=1.6