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