1. (72+a)+29=72+a+29=a+101
2. 43+(96+b)=43+(b+96)=b+139
3. m+1001+9999=m+11000
4. 1273+n+2127=n+3400
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Answers & Comments
1. (72+a)+29=72+a+29=a+101
2. 43+(96+b)=43+(b+96)=b+139
3. m+1001+9999=m+11000
4. 1273+n+2127=n+3400