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-x+3y=12 persamaan 2
x+y=6
x=6-y
substitusi x=6-y ke persamaan 2
-x+3y=12
-(6-y)+3y=12
4y=18
y=4.5
substitusi y=4.5 ke persamaan 1
x+y=6
x+4.5=6
x=1.5