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2x=4-7y
x=
x disubtitusikan ke persamaan 2
4x-y=8
4-y=8
8-14y=8
-14y=8-8
y=0/-14
y=0
y disubstitusikan ke persamaan 1
2x+7y=4
2x+7.0=4
2x=4
x=2