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(a+2)+a=5
We move all terms to the left:
(a+2)+a-(5)=0
We add all the numbers together, and all the variables
a+(a+2)-5=0
We get rid of parentheses
a+a+2-5=0
We add all the numbers together, and all the variables
2a-3=0
We move all terms containing a to the left, all other terms to the right
2a=3
a=3/2
a=1+1/2
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