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8=a/7-6
We move all terms to the left:
8-(a/7-6)=0
We get rid of parentheses
-a/7+6+8=0
We multiply all the terms by the denominator
-a+6*7+8*7=0
We add all the numbers together, and all the variables
-1a+98=0
We move all terms containing a to the left, all other terms to the right
-a=-98
a=-98/-1
a=+98
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