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Y-2 = (2/5)*(x-9) // - (2/5)*(x-9)
Y-((2/5)*(x-9))-2 = 0
(-2/5)*(x-9)+Y-2 = 0
Y-2/5*(x-9)-2 = 0
Y-2/5*(x-9)-2 = 0
Y-2/5*x-2+18/5 = 0
Y-2/5*x+8/5 = 0
Y-2/5*x+8/5 = 0
Y-2/5*x+8/5 = 0 // - Y+8/5
-2/5*x = -(Y+8/5) // : -2/5
x = (-(Y+8/5))/(-2/5)
x = 5/2*(Y+8/5)
x = 5/2*(Y+8/5)
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