Question

1) -10z+75=-5z
2) 28=7n-7
3) 30-15z=40-14z
4) 17-8y=4y-7

Answer 1

1) -10z+5z=-75
-5z=-75
z=15
2) -7n=-35
n=5
3)-15z+14z=40-30
-z=10
z=-10
4)-8y-4y=-17-7
-12y=-24
y=2