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y-20 = (-3/5)*(x-4) // - (-3/5)*(x-4)
y-((-3/5)*(x-4))-20 = 0
(3/5)*(x-4)+y-20 = 0
3/5*(x-4)+y-20 = 0
3/5*(x-4)+y-20 = 0
3/5*x+y-20-12/5 = 0
3/5*x+y-112/5 = 0
3/5*x+y-112/5 = 0
3/5*x+y-112/5 = 0 // - y-112/5
3/5*x = -(y-112/5) // : 3/5
x = (-(y-112/5))/3/5
x = 5/3*(112/5-y)
x = 5/3*(112/5-y)
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