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x in (-oo:+oo)
18 = (9/11)*x // - (9/11)*x
18-((9/11)*x) = 0
(-9/11)*x+18 = 0
18-9/11*x = 0 // - 18
-9/11*x = -18 // : -9/11
x = -18/(-9/11)
x = 22
x = 22
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