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3x-y=9
---------- -
-2x = -8
x = -8/-2 = 4
x-y=1
4-y=1
y= 4-1 = 3
x-y=1
3x-y=9
------------ -
-2x=-8
x=4
substitusi x=4 ke
x-y=1
4-y=1
-y=1-4
y=3