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3100-21x=3472-33x
We move all terms to the left:
3100-21x-(3472-33x)=0
We add all the numbers together, and all the variables
-21x-(-33x+3472)+3100=0
We get rid of parentheses
-21x+33x-3472+3100=0
We add all the numbers together, and all the variables
12x-372=0
We move all terms containing x to the left, all other terms to the right
12x=372
x=372/12
x=31
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