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u in (-oo:+oo)
-5.1 = u/4+1.3 // - u/4+1.3
-(u/4)-5.1-1.3 = 0
-1/4*u-6.4 = 0 // + 6.4
-1/4*u = 6.4 // : -1/4
u = 6.4/(-1/4)
u = -25.6
u = -25.6
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