Question 342974
You need to get a common denominator before you can add/subtract the numerators.
{{{(2/3)(4/4)=8/12}}}
{{{-(1/4)(3/3)=-(3/12)}}}
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{{{(2/3)+(-1/4)=8/12+(-3/12)}}}
{{{(2/3)+(-1/4)=(8-3)/12)}}}
{{{(2/3)+(-1/4)=highlight(5/12))}}}