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1-a/9-4=0
We add all the numbers together, and all the variables
-a/9-3=0
We multiply all the terms by the denominator
-a-3*9=0
We add all the numbers together, and all the variables
-1a-27=0
We move all terms containing a to the left, all other terms to the right
-a=27
a=27/-1
a=-27
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