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x-2y=-4
_________
4x + 6y = 26
3x - 6y = -12
_________
× = 38 ,maka
x - 2y = -4
38 - 2y = -4
-2y = -4 -38
-2y = -42
y = -42/-2
y = 21
jadi x + y = 38 + 21 =59