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