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x in (-oo:+oo)
8/15 = x/6 // - x/6
8/15-(x/6) = 0
8/15-1/6*x = 0 // - 8/15
-1/6*x = -8/15 // : -1/6
x = -8/15/(-1/6)
x = 16/5
x = 16/5
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