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= 2x + 8 + 4x - 5 - 5y
= (2x + 4x) + (8 - 5) -5y
= 6x + 3 - 5y
maaf kalo salah :)
(2x + 8) + (4x - 5 - 5y)
= 2x + 8 + 4x - 5 - 5y
= (2x + 4x) + (8 - 5) -5y
= 6x -3y -3