10-9y=70-6у 10z+7-9z+5 25-13m=45-8m

Question

10-9y=70-6у
10z+7-9z+5
25-13m=45-8m

Answer 1

1.10-70=-6y+9y
-60=3y
y=-60:3
y=-20

2.10z-9z+7+5=z+12

3.25-45=-8m+13m
-20=5m
m=-20:5
m=-4