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x in (-oo:+oo)
y = b+(2/5)*x // - b+(2/5)*x
y-b-((2/5)*x) = 0
(-2/5)*x-b+y = 0
y-b-2/5*x = 0 // - y-b
-2/5*x = -(y-b) // : -2/5
x = (-(y-b))/(-2/5)
x = -5/2*(b-y)
x = -5/2*(b-y)
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