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u in (-oo:+oo)
-2/3 = (2/7)*u-(7/3) // - (2/7)*u-(7/3)
7/3-((2/7)*u)-2/3 = 0
(-2/7)*u-2/3+7/3 = 0
5/3-2/7*u = 0 // - 5/3
-2/7*u = -5/3 // : -2/7
u = -5/3/(-2/7)
u = 35/6
u = 35/6
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