Question 1192891
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the fraction is increased 1/12`
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What's that?  Increased how?   "1/12" assumed to be missing "by".


Original Fraction Expression,  {{{n/d}}} with {{{n=d-1}}}, so fraction may start as  {{{(d-1)/d}}}.


When both n and d increased by 2,
{{{(d-1+2)/(d+2)=(d-1)/d+(1/12)((d-1)/d)}}}.
Solve this for d.