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u in (-oo:+oo)
20 = (4/7)*u // - (4/7)*u
20-((4/7)*u) = 0
(-4/7)*u+20 = 0
20-4/7*u = 0 // - 20
-4/7*u = -20 // : -4/7
u = -20/(-4/7)
u = 35
u = 35
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