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x in (-oo:+oo)
5/15 = x/18 // - x/18
5/15-(x/18) = 0
1/3-1/18*x = 0 // - 1/3
-1/18*x = -1/3 // : -1/18
x = -1/3/(-1/18)
x = 6
x = 6
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