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u in (-oo:+oo)
8 = (-2/5)*u // - (-2/5)*u
8-((-2/5)*u) = 0
(2/5)*u+8 = 0
2/5*u+8 = 0 // - 8
2/5*u = -8 // : 2/5
u = -8/2/5
u = -20
u = -20
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