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