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13=5-8a
We move all terms to the left:
13-(5-8a)=0
We add all the numbers together, and all the variables
-(-8a+5)+13=0
We get rid of parentheses
8a-5+13=0
We add all the numbers together, and all the variables
8a+8=0
We move all terms containing a to the left, all other terms to the right
8a=-8
a=-8/8
a=-1
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