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u in (-oo:+oo)
5 = (2/3)*u-3 // - (2/3)*u-3
3-((2/3)*u)+5 = 0
(-2/3)*u+3+5 = 0
8-2/3*u = 0 // - 8
-2/3*u = -8 // : -2/3
u = -8/(-2/3)
u = 12
u = 12
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