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-3x+3y=8
2x=-9-9y/:2
-3x+3y=8
x=4½-4½y
-3(4½-4½y)+3y=8
x=4½-4½y
-13,5+13,5y+3y=8
x=4½-4½y
16,5y=21,5 /:16,5