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6a-13=2a-19
We move all terms to the left:
6a-13-(2a-19)=0
We get rid of parentheses
6a-2a+19-13=0
We add all the numbers together, and all the variables
4a+6=0
We move all terms containing a to the left, all other terms to the right
4a=-6
a=-6/4
a=-1+1/2
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