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9a+13-4a=12+5a-3
We move all terms to the left:
9a+13-4a-(12+5a-3)=0
We add all the numbers together, and all the variables
9a-4a-(5a+9)+13=0
We add all the numbers together, and all the variables
5a-(5a+9)+13=0
We get rid of parentheses
5a-5a-9+13=0
We add all the numbers together, and all the variables
4!=0
There is no solution for this equation
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