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y -12 = 5/2(x -(-7))
y -12 = 5/2x +35/2 dikali 2 untuk menghilangkan penyebut, sehingga
2y -24 = 5x +35
2y = 5x +35 +24
2y = 5x +59
5x -2y +59 = 0
y - 12 = (5/2)(x + 7)
2y - 24 = 5x + 35
5x - 2y + 59 = 0