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-13=-6-6a+5
We move all terms to the left:
-13-(-6-6a+5)=0
We add all the numbers together, and all the variables
-(-6a-1)-13=0
We get rid of parentheses
6a+1-13=0
We add all the numbers together, and all the variables
6a-12=0
We move all terms containing a to the left, all other terms to the right
6a=12
a=12/6
a=2
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