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Y-7 = (-4/5)*(x-4) // - (-4/5)*(x-4)
Y-((-4/5)*(x-4))-7 = 0
(4/5)*(x-4)+Y-7 = 0
4/5*(x-4)+Y-7 = 0
4/5*(x-4)+Y-7 = 0
Y+4/5*x-7-16/5 = 0
Y+4/5*x-51/5 = 0
Y+4/5*x-51/5 = 0
Y+4/5*x-51/5 = 0 // - Y-51/5
4/5*x = -(Y-51/5) // : 4/5
x = (-(Y-51/5))/4/5
x = 5/4*(51/5-Y)
x = 5/4*(51/5-Y)
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