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x=7y+6......(2)
substitusi nilai persamaan (2) ke persamaan (1)
4x-y=3
4(7y+6)-y=3
28y+24-y=3
27y=3-24
27y=-21
y=-21/27
y=-7/9
substitusi nilai y ke persamaan (2)
x=7(-7/9)+6
x=-49/9+6
x=-49/9+54/9
x=5/9