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u in (-oo:+oo)
2*u-5 = (3*u)/7 // - (3*u)/7
2*u-((3*u)/7)-5 = 0
2*u+(-3/7)*u-5 = 0
11/7*u-5 = 0 // + 5
11/7*u = 5 // : 11/7
u = 5/11/7
u = 35/11
u = 35/11
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