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3(2y+x)=6
8y - 9x = 60
6y +3x = 6 /*3
8y - 9x = 60
18y + 9x = 18
(+)-----------------
26y=78
y=3
y=3
6y+3x=6
y=3
18+3x=6
y=3
3x=-12
y=3
x=-4