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9*(y-3) = 9*(-5/6)*(x+9) // - 9*(-5/6)*(x+9)
9*(y-3)-(9*(-5/6)*(x+9)) = 0
9*(y-3)+(15/2)*(x+9) = 0
9*(y-3)+15/2*(x+9) = 0
9*(y-3)+15/2*(x+9) = 0
15/2*x+9*y+81/2 = 0
15/2*x+9*y+81/2 = 0
15/2*x+9*y+81/2 = 0 // - 9*y+81/2
15/2*x = -(9*y+81/2) // : 15/2
x = (-(9*y+81/2))/15/2
x = -2/15*(9*y+81/2)
x = -2/15*(9*y+81/2)
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