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4x - y = -16 -> 4x - y = -16 -
-5y = -20
y = 4
4x - y = -16
4x - 4 = -16
4x = -12
x = -12 : 4
x = -3
nilai 5x +2y = 5 x (-3) + 2 x 4
= -15 + 8
= -7