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