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x in (-oo:+oo)
7/2 = x/11 // - x/11
7/2-(x/11) = 0
7/2-1/11*x = 0 // - 7/2
-1/11*x = -7/2 // : -1/11
x = -7/2/(-1/11)
x = 77/2
x = 77/2
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