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21+x=12x-1
We move all terms to the left:
21+x-(12x-1)=0
We get rid of parentheses
x-12x+1+21=0
We add all the numbers together, and all the variables
-11x+22=0
We move all terms containing x to the left, all other terms to the right
-11x=-22
x=-22/-11
x=+2
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