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x in (-oo:+oo)
X/2 = (x-2)/18 // - (x-2)/18
X/2-((x-2)/18) = 0
(-1*(x-2))/18+X/2 = 0
(-1*2*(x-2))/(2*18)+(18*X)/(2*18) = 0
18*X-1*2*(x-2) = 0
18*X-2*x+4 = 0
(18*X-2*x+4)/(2*18) = 0
(18*X-2*x+4)/(2*18) = 0 // * 2*18
18*X-2*x+4 = 0
18*X-2*x+4 = 0 // - 18*X+4
-2*x = -(18*X+4) // : -2
x = (-(18*X+4))/(-2)
x = (18*X+4)/2
x = (18*X+4)/2
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