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