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x in (-oo:+oo)
X-5 = 4-((4/5)*x) // - 4-((4/5)*x)
X+(4/5)*x-5-4 = 0
X+4/5*x-9 = 0 // - X-9
4/5*x = -(X-9) // : 4/5
x = (-(X-9))/4/5
x = 5/4*(9-X)
x = 5/4*(9-X)
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