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x in (-oo:+oo)
5/7 = x/11 // - x/11
5/7-(x/11) = 0
5/7-1/11*x = 0 // - 5/7
-1/11*x = -5/7 // : -1/11
x = -5/7/(-1/11)
x = 55/7
x = 55/7
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