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9=10a/9
We move all terms to the left:
9-(10a/9)=0
We add all the numbers together, and all the variables
-(+10a/9)+9=0
We get rid of parentheses
-10a/9+9=0
We multiply all the terms by the denominator
-10a+9*9=0
We add all the numbers together, and all the variables
-10a+81=0
We move all terms containing a to the left, all other terms to the right
-10a=-81
a=-81/-10
a=8+1/10
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