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-1+a/3=-3
We move all terms to the left:
-1+a/3-(-3)=0
We add all the numbers together, and all the variables
a/3+2=0
We multiply all the terms by the denominator
a+2*3=0
We add all the numbers together, and all the variables
a+6=0
We move all terms containing a to the left, all other terms to the right
a=-6
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