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x in (-oo:+oo)
7/11 = x/15 // - x/15
7/11-(x/15) = 0
7/11-1/15*x = 0 // - 7/11
-1/15*x = -7/11 // : -1/15
x = -7/11/(-1/15)
x = 105/11
x = 105/11
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