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-13-4a=3-6a
We move all terms to the left:
-13-4a-(3-6a)=0
We add all the numbers together, and all the variables
-4a-(-6a+3)-13=0
We get rid of parentheses
-4a+6a-3-13=0
We add all the numbers together, and all the variables
2a-16=0
We move all terms containing a to the left, all other terms to the right
2a=16
a=16/2
a=8
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