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y-4 = (-1/5)*(x-3) // - (-1/5)*(x-3)
y-((-1/5)*(x-3))-4 = 0
(1/5)*(x-3)+y-4 = 0
1/5*(x-3)+y-4 = 0
1/5*(x-3)+y-4 = 0
1/5*x+y-4-3/5 = 0
1/5*x+y-23/5 = 0
1/5*x+y-23/5 = 0
1/5*x+y-23/5 = 0 // - y-23/5
1/5*x = -(y-23/5) // : 1/5
x = (-(y-23/5))/1/5
x = 5*(23/5-y)
x = 5*(23/5-y)
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