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-3-x/3=4
We move all terms to the left:
-3-x/3-(4)=0
We add all the numbers together, and all the variables
-x/3-7=0
We multiply all the terms by the denominator
-x-7*3=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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