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a+2a+3=-1+2a+4
We move all terms to the left:
a+2a+3-(-1+2a+4)=0
We add all the numbers together, and all the variables
a+2a-(2a+3)+3=0
We add all the numbers together, and all the variables
3a-(2a+3)+3=0
We get rid of parentheses
3a-2a-3+3=0
We add all the numbers together, and all the variables
a=0
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