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u in (-oo:+oo)
-40 = -u/8 // + -u/8
-(-u/8)-40 = 0
(1/8)*u-40 = 0
1/8*u-40 = 0 // + 40
1/8*u = 40 // : 1/8
u = 40/1/8
u = 320
u = 320
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