Answer :

This is a literal equation
 first, divide 3 on both sides  [tex] \frac{A}{3} = \frac{3(B+C)}{3} [/tex]
Next, subtract C on both sides  [tex] \frac{A}{3} -C=B+C-C[/tex]


The answer is [tex]B= \frac{A}{3} -C[/tex]

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