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