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2x-y-3=0
y=2x-3
disubstitusi ke persamaan pertama
x+4(2x-3)-6=0
x+8x-12-6=0
9x-18=0
9x=18
x=18/9=2
y=2x-3
y=2(2)-3
y=4-3=1
x=2
y=1