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12x=2x+571-21
We move all terms to the left:
12x-(2x+571-21)=0
We add all the numbers together, and all the variables
12x-(2x+550)=0
We get rid of parentheses
12x-2x-550=0
We add all the numbers together, and all the variables
10x-550=0
We move all terms containing x to the left, all other terms to the right
10x=550
x=550/10
x=55
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