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72=83-x
We move all terms to the left:
72-(83-x)=0
We add all the numbers together, and all the variables
-(-1x+83)+72=0
We get rid of parentheses
1x-83+72=0
We add all the numbers together, and all the variables
x-11=0
We move all terms containing x to the left, all other terms to the right
x=11
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