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9a+13=6a-11a
We move all terms to the left:
9a+13-(6a-11a)=0
We add all the numbers together, and all the variables
9a-(-5a)+13=0
We get rid of parentheses
9a+5a+13=0
We add all the numbers together, and all the variables
14a+13=0
We move all terms containing a to the left, all other terms to the right
14a=-13
a=-13/14
a=-13/14
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