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u in (-oo:+oo)
16 = (4/7)*u // - (4/7)*u
16-((4/7)*u) = 0
(-4/7)*u+16 = 0
16-4/7*u = 0 // - 16
-4/7*u = -16 // : -4/7
u = -16/(-4/7)
u = 28
u = 28
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