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x in (-oo:+oo)
y-5 = (2/5)*(x-4) // - (2/5)*(x-4)
y-((2/5)*(x-4))-5 = 0
(-2/5)*(x-4)+y-5 = 0
y-2/5*(x-4)-5 = 0
y-2/5*(x-4)-5 = 0
y-2/5*x-5+8/5 = 0
y-2/5*x-17/5 = 0
y-2/5*x-17/5 = 0
y-2/5*x-17/5 = 0 // - y-17/5
-2/5*x = -(y-17/5) // : -2/5
x = (-(y-17/5))/(-2/5)
x = -5/2*(17/5-y)
x = -5/2*(17/5-y)
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