Question 283913
I'm ignoring the "l-joint" part, and just going to add the two fractions.

{{{(19/3) + (97/12)}}} First, put everything with a common denominator (12)
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{{{(19/3)*(4/4) + (97/12)}}}
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{{{(76/12) + (97/12)}}}
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{{{highlight(173/12)}}}