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u in (-oo:+oo)
7*u = -1/5 // + -1/5
7*u-(-1/5) = 0
7*u+1/5 = 0
7*u+1/5 = 0 // - 1/5
7*u = -1/5 // : 7
u = -1/5/7
u = -1/35
u = -1/35
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