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x in (-oo:+oo)
Y = (-2/5)*x-8 // - (-2/5)*x-8
Y-((-2/5)*x)+8 = 0
Y+(2/5)*x+8 = 0
Y+2/5*x+8 = 0 // - Y+8
2/5*x = -(Y+8) // : 2/5
x = (-(Y+8))/2/5
x = -5/2*(Y+8)
x = -5/2*(Y+8)
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