51z=357
z=357:51
z=7
2x-15=13
2x=28
x=28:2
x=14
7y-25=45
7y=70
y=70:7
y=10
130-4x=70
- 4x=70-130
- 4x = - 60
x=15
51z=357
z=357:51
z=7
2x-15=13
2x=28
x=28:2
x=14
7y-25=45
7y=70
y=70:7
y=10
130-4x=70
- 4x=70-130
- 4x = - 60
x=15