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u in (-oo:+oo)
-8.8 = u/4-2.4 // - u/4-2.4
2.4-(u/4)-8.8 = 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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