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x in (-oo:+oo)
y = (1/5)*x-(4/5) // - (1/5)*x-(4/5)
y-((1/5)*x)+4/5 = 0
(-1/5)*x+y+4/5 = 0
y-1/5*x+4/5 = 0 // - y+4/5
-1/5*x = -(y+4/5) // : -1/5
x = (-(y+4/5))/(-1/5)
x = 5*(y+4/5)
x = 5*(y+4/5)
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