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Y-6 = (-4/5)*(x-3) // - (-4/5)*(x-3)
Y-((-4/5)*(x-3))-6 = 0
(4/5)*(x-3)+Y-6 = 0
4/5*(x-3)+Y-6 = 0
4/5*(x-3)+Y-6 = 0
Y+4/5*x-6-12/5 = 0
Y+4/5*x-42/5 = 0
Y+4/5*x-42/5 = 0
Y+4/5*x-42/5 = 0 // - Y-42/5
4/5*x = -(Y-42/5) // : 4/5
x = (-(Y-42/5))/4/5
x = 5/4*(42/5-Y)
x = 5/4*(42/5-Y)
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