4a+7b-3a-5b=a+2b
3x+4y-2x1=x=4y
2a/4+4b*2 =3a=8b
8m*5+6m =46m
8a+5b-b =8a+4b
5a-a-b-3b=4a-4b
6a*3-18b/9=18a-2