3х^2+7x+2     3х^2+х+6х+2       х(3х+1)+2(3х+1)     (3х+1)(х+2)      х+2

------------- = ------------------- = -------------------- = --------------- = -------  = 1+2/х

  3х^2+х            х(3х+1)                  х(3х+1)              х(3х+1)            х