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