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2x - 2y - 4 = 0⇔ 2x - 2y = 4
x - 2y = 7
2x - 2y = 4
----------------- -
-x = 3
x = -3
x - 2y = 7 ⇔ -3 - 2y = 7
-2y = 10
y = -5
Jadi Hp = {(-3,-5)}