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u in (-oo:+oo)
-1.12 = u/4+4 // - u/4+4
-(u/4)-4-1.12 = 0
-1/4*u-5.12 = 0 // + 5.12
-1/4*u = 5.12 // : -1/4
u = 5.12/(-1/4)
u = -20.48
u = -20.48
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