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12=a/9-6
We move all terms to the left:
12-(a/9-6)=0
We get rid of parentheses
-a/9+6+12=0
We multiply all the terms by the denominator
-a+6*9+12*9=0
We add all the numbers together, and all the variables
-1a+162=0
We move all terms containing a to the left, all other terms to the right
-a=-162
a=-162/-1
a=+162
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