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