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x in (-oo:+oo)
y+0 = (-1/5)*(x-4) // - (-1/5)*(x-4)
y-((-1/5)*(x-4))+0 = 0
(1/5)*(x-4)+y = 0
1/5*(x-4)+y = 0
1/5*(x-4)+y = 0
1/5*x+y-4/5 = 0
1/5*x+y-4/5 = 0
1/5*x+y-4/5 = 0 // - y-4/5
1/5*x = -(y-4/5) // : 1/5
x = (-(y-4/5))/1/5
x = 5*(4/5-y)
x = 5*(4/5-y)
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