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13-a/11=7
We move all terms to the left:
13-a/11-(7)=0
We add all the numbers together, and all the variables
-a/11+6=0
We multiply all the terms by the denominator
-a+6*11=0
We add all the numbers together, and all the variables
-1a+66=0
We move all terms containing a to the left, all other terms to the right
-a=-66
a=-66/-1
a=+66
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