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x in (-oo:+oo)
10/15 = x/18 // - x/18
10/15-(x/18) = 0
2/3-1/18*x = 0 // - 2/3
-1/18*x = -2/3 // : -1/18
x = -2/3/(-1/18)
x = 12
x = 12
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