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17-y=0
4y-x=6
-y=-17 /*(-1)
4y-x=6
y=17
4*17-x=6
y=17
68-x=6
y=17
-x=6-68
y=17
-x=-62 /*(-1)
y=17
x=62
y=17
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3m+n=9
2m-5n=-11
n=9-3m
2m-5(9-3m)=-11
n=9-3m
2m-45+15m=-11
n=9-3m
17m=-11+45
n=9-3m
17m=34
n=9-3m
m=2
n=9-3*2
m=2
n=3
m=2