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u in (-oo:+oo)
-15.5 = u/7 // - u/7
-(u/7)-15.5 = 0
-1/7*u-15.5 = 0 // + 15.5
-1/7*u = 15.5 // : -1/7
u = 15.5/(-1/7)
u = -108.50000217
u = -108.50000217
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