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