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-3+x/21=-1
We move all terms to the left:
-3+x/21-(-1)=0
We add all the numbers together, and all the variables
x/21-2=0
We multiply all the terms by the denominator
x-2*21=0
We add all the numbers together, and all the variables
x-42=0
We move all terms containing x to the left, all other terms to the right
x=42
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