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x in (-oo:+oo)
5/6 = x/15 // - x/15
5/6-(x/15) = 0
5/6-1/15*x = 0 // - 5/6
-1/15*x = -5/6 // : -1/15
x = -5/6/(-1/15)
x = 25/2
x = 25/2
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