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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
a+66=0
We move all terms containing a to the left, all other terms to the right
a=-66
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