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2=10a-9a
We move all terms to the left:
2-(10a-9a)=0
We add all the numbers together, and all the variables
-(+a)+2=0
We get rid of parentheses
-a+2=0
We add all the numbers together, and all the variables
-1a+2=0
We move all terms containing a to the left, all other terms to the right
-a=-2
a=-2/-1
a=+2
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