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u in (-oo:+oo)
-7.4 = u/5+5.1 // - u/5+5.1
-(u/5)-7.4-5.1 = 0
-1/5*u-12.5 = 0 // + 12.5
-1/5*u = 12.5 // : -1/5
u = 12.5/(-1/5)
u = -62.5
u = -62.5
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