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(a+1)+a=73
We move all terms to the left:
(a+1)+a-(73)=0
We add all the numbers together, and all the variables
a+(a+1)-73=0
We get rid of parentheses
a+a+1-73=0
We add all the numbers together, and all the variables
2a-72=0
We move all terms containing a to the left, all other terms to the right
2a=72
a=72/2
a=36
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