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x-y=3
x=3+y ...persamaan 1
3x-5y=13
3(3+y)-5y=13
9+3y-5y=13
-2y=13-9
-2y=4
y=-2
x-y=3
x-(-2)=3
x+2=3
x=1
3x(3+y)-5y=13
9+3y-5y=13
-2y=13-9
y=-2
maka
x=3+(-2)
x=1