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(a+16)+a=72
We move all terms to the left:
(a+16)+a-(72)=0
We add all the numbers together, and all the variables
a+(a+16)-72=0
We get rid of parentheses
a+a+16-72=0
We add all the numbers together, and all the variables
2a-56=0
We move all terms containing a to the left, all other terms to the right
2a=56
a=56/2
a=28
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