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y-11 = (-9/5)*(x-6) // - (-9/5)*(x-6)
y-((-9/5)*(x-6))-11 = 0
(9/5)*(x-6)+y-11 = 0
9/5*(x-6)+y-11 = 0
9/5*(x-6)+y-11 = 0
9/5*x+y-11-54/5 = 0
9/5*x+y-109/5 = 0
9/5*x+y-109/5 = 0
9/5*x+y-109/5 = 0 // - y-109/5
9/5*x = -(y-109/5) // : 9/5
x = (-(y-109/5))/9/5
x = 5/9*(109/5-y)
x = 5/9*(109/5-y)
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