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x in (-oo:+oo)
X/4-((x-9)/5) = 5*x // - 5*x
X/4-((x-9)/5)-(5*x) = 0
X/4-((x-9)/5)-5*x = 0
(-1*(x-9))/5+X/4-5*x = 0
(-1*4*(x-9))/(4*5)+(5*X)/(4*5)+(-5*4*5*x)/(4*5) = 0
5*X-1*4*(x-9)-5*4*5*x = 0
5*X-4*x-100*x+36 = 0
5*X-104*x+36 = 0
(5*X-104*x+36)/(4*5) = 0
(5*X-104*x+36)/(4*5) = 0 // * 4*5
5*X-104*x+36 = 0
5*X-104*x+36 = 0 // - 5*X+36
-104*x = -(5*X+36) // : -104
x = (-(5*X+36))/(-104)
x = (5*X+36)/104
x = (5*X+36)/104
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