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y-0 / 3-0 = x-(-6)/ 3-(-6)
y-0 / 3 = x+6 / 3+6
y-0 / 3 = x+6 / 9
9(y-0) = 3 (x+6)
9y-0 = 3x + 18
9y-3x = 18
9y-3x-18 = 0 atau 3x-9y+18=0