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y - (-6) = 7/2 ( x - 4)
(y + 6 = 7/2x - 28/2) x 2 (dikali 2 agar pecahannya hilang)
2y + 12 = 7x - 28
= 7x - 2y - 28 - 12
= 7x - 2y - 40 = 0