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13=-6a-5-6
We move all terms to the left:
13-(-6a-5-6)=0
We add all the numbers together, and all the variables
-(-6a-11)+13=0
We get rid of parentheses
6a+11+13=0
We add all the numbers together, and all the variables
6a+24=0
We move all terms containing a to the left, all other terms to the right
6a=-24
a=-24/6
a=-4
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