Proof

Complete the proof If 7a + b = 24 and b = 3, then a = 3

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7a + b = 24
7a + 3 = 24   {substituted 3 in for b}
7a = 21   {subtracted 3 from each side}
a = 3   {divided each side by 7}

Not written as a proof, but it is proof.

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