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( ) = ( )
6 +xy 2y-3x 0 -12
6x+4y = 0 |x1| 6x+4y = 0
-3x+2y = -12 |x2| -6x+4y=-24
------------------ +
8y = -24
y= -3
-3x + 2(-3) =-12
-3x = -12 +6
-3x = -6
x = 2
jadi nilai x + y = 2 + (-3) = -1
maaf ga pakai equation..