add: a+b+ab;b-c+bc and c+a+ac
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3
Answer:
2a +2b+ab. a. n. s. w. e. r. .
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4
Answer:
a+b+ab+b-c+bc+c+a+ac
a+a+b+b+c-c+ab+bc+ac
2a+2b+ab+bc+ac
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