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