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Y-5 = (1/9)*(x-9) // - (1/9)*(x-9)
Y-((1/9)*(x-9))-5 = 0
(-1/9)*(x-9)+Y-5 = 0
Y-1/9*(x-9)-5 = 0
Y-1/9*(x-9)-5 = 0
Y-1/9*x-5+1 = 0
Y-1/9*x-4 = 0
Y-1/9*x-4 = 0
Y-1/9*x-4 = 0 // - Y-4
-1/9*x = -(Y-4) // : -1/9
x = (-(Y-4))/(-1/9)
x = -9*(4-Y)
x = -9*(4-Y)
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