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X in (-oo:+oo)
18-(2*(1/28)*X) = 9-((1/28)*X) // - 9-((1/28)*X)
(1/28)*X-(2*(1/28)*X)-9+18 = 0
(-1/14)*X+(1/28)*X-9+18 = 0
9-1/28*X = 0 // - 9
-1/28*X = -9 // : -1/28
X = -9/(-1/28)
X = 252
X = 252
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