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x in (-oo:+oo)
y = (-2/5)*x+40 // - (-2/5)*x+40
y-((-2/5)*x)-40 = 0
(2/5)*x+y-40 = 0
2/5*x+y-40 = 0 // - y-40
2/5*x = -(y-40) // : 2/5
x = (-(y-40))/2/5
x = 5/2*(40-y)
x = 5/2*(40-y)
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