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u in (-oo:+oo)
10 = (2/3)*u // - (2/3)*u
10-((2/3)*u) = 0
(-2/3)*u+10 = 0
10-2/3*u = 0 // - 10
-2/3*u = -10 // : -2/3
u = -10/(-2/3)
u = 15
u = 15
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