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x in (-oo:+oo)
5/15 = x/6 // - x/6
5/15-(x/6) = 0
1/3-1/6*x = 0 // - 1/3
-1/6*x = -1/3 // : -1/6
x = -1/3/(-1/6)
x = 2
x = 2
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