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42+2a-16=a+49
We move all terms to the left:
42+2a-16-(a+49)=0
We add all the numbers together, and all the variables
2a-(a+49)+26=0
We get rid of parentheses
2a-a-49+26=0
We add all the numbers together, and all the variables
a-23=0
We move all terms containing a to the left, all other terms to the right
a=23
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