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u in (-oo:+oo)
-3.2 = u/7+19.2 // - u/7+19.2
-(u/7)-19.2-3.2 = 0
-1/7*u-22.4 = 0 // + 22.4
-1/7*u = 22.4 // : -1/7
u = 22.4/(-1/7)
u = -156.80000314
u = -156.80000314
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