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x in (-oo:+oo)
1/15+1/18 = 11*x // - 11*x
1/15-(11*x)+1/18 = 0
1/15-11*x+1/18 = 0
11/90-11*x = 0 // - 11/90
-11*x = -11/90 // : -11
x = -11/90/(-11)
x = 1/90
x = 1/90
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