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u in (-oo:+oo)
u/7-2.5 = -13.7 // + 13.7
u/7-2.5+13.7 = 0
1/7*u+11.2 = 0 // - 11.2
1/7*u = -11.2 // : 1/7
u = -11.2/1/7
u = -78.40000157
u = -78.40000157
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