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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
2/5*x+y+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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