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Y-2 = (5/4)*(x-4) // - (5/4)*(x-4)
Y-((5/4)*(x-4))-2 = 0
(-5/4)*(x-4)+Y-2 = 0
Y-5/4*(x-4)-2 = 0
Y-5/4*(x-4)-2 = 0
Y-5/4*x-2+5 = 0
Y-5/4*x+3 = 0
Y-5/4*x+3 = 0
Y-5/4*x+3 = 0 // - Y+3
-5/4*x = -(Y+3) // : -5/4
x = (-(Y+3))/(-5/4)
x = 4/5*(Y+3)
x = 4/5*(Y+3)
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