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6=a/7-5
We move all terms to the left:
6-(a/7-5)=0
We get rid of parentheses
-a/7+5+6=0
We multiply all the terms by the denominator
-a+5*7+6*7=0
We add all the numbers together, and all the variables
-1a+77=0
We move all terms containing a to the left, all other terms to the right
-a=-77
a=-77/-1
a=+77
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