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(4/5)*(x-3) = y // - y
(4/5)*(x-3)-y = 0
4/5*(x-3)-y = 0
4/5*(x-3)-y = 0
4/5*x-y-12/5 = 0
4/5*x-y-12/5 = 0
4/5*x-y-12/5 = 0 // + -y-12/5
4/5*x = -(-y-12/5) // : 4/5
x = (-(-y-12/5))/4/5
x = 5/4*(y+12/5)
x = 5/4*(y+12/5)
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