Answer
$\frac{73}{21a}$
Work Step by Step
$\frac{15}{7a}$+$\frac{8}{6a}$=
$\frac{15*6}{7a*6}$+$\frac{8*7}{6a*7}$=
$\frac{90}{42a}$+$\frac{56}{42a}$=$\frac{90+56}{42a}$=
$\frac{146}{42a}$=$\frac{73}{21a}$
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