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u in (-oo:+oo)
u+6/2 = 5*u+2/7+1 // - 5*u+2/7+1
u-(5*u)+6/2-(2/7)-1 = 0
u-5*u+6/2-2/7-1 = 0
12/7-4*u = 0 // - 12/7
-4*u = -12/7 // : -4
u = -12/7/(-4)
u = 3/7
u = 3/7
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