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u in (-oo:+oo)
-25 = -u/5 // + -u/5
-(-u/5)-25 = 0
(1/5)*u-25 = 0
1/5*u-25 = 0 // + 25
1/5*u = 25 // : 1/5
u = 25/1/5
u = 125
u = 125
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