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u in (-oo:+oo)
-5 = -u/4 // + -u/4
-(-u/4)-5 = 0
(1/4)*u-5 = 0
1/4*u-5 = 0 // + 5
1/4*u = 5 // : 1/4
u = 5/1/4
u = 20
u = 20
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