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6a-(3-a)=5a-13
We move all terms to the left:
6a-(3-a)-(5a-13)=0
We add all the numbers together, and all the variables
6a-(-1a+3)-(5a-13)=0
We get rid of parentheses
6a+1a-5a-3+13=0
We add all the numbers together, and all the variables
2a+10=0
We move all terms containing a to the left, all other terms to the right
2a=-10
a=-10/2
a=-5
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