x=y+12
y/7+4=x/5
5y+140=7x
5y+140=7y+84
2y=56
y=28
x=40
y/7=x/5-4
y/7=(y+12)/5-4 |*35
5y=7(y+12)-140
5y=7y+84-140
-2y=-56
x=28+12
x=y+12
y/7+4=x/5
5y+140=7x
5y+140=7y+84
2y=56
y=28
x=40
x=y+12
y/7=x/5-4
y/7=(y+12)/5-4 |*35
5y=7(y+12)-140
5y=7y+84-140
-2y=-56
y=28
x=28+12
x=40