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-10=a/9-9
We move all terms to the left:
-10-(a/9-9)=0
We get rid of parentheses
-a/9+9-10=0
We multiply all the terms by the denominator
-a+9*9-10*9=0
We add all the numbers together, and all the variables
-1a-9=0
We move all terms containing a to the left, all other terms to the right
-a=9
a=9/-1
a=-9
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