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0=9a+7
We move all terms to the left:
0-(9a+7)=0
We add all the numbers together, and all the variables
-(9a+7)=0
We get rid of parentheses
-9a-7=0
We move all terms containing a to the left, all other terms to the right
-9a=7
a=7/-9
a=-7/9
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