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u in (-oo:+oo)
6*u+5*u+7/7+9/2 = 29 // - 29
6*u+5*u+7/7+9/2-29 = 0
11*u-47/2 = 0 // + 47/2
11*u = 47/2 // : 11
u = 47/2/11
u = 47/22
u = 47/22
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