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2x=21+3x+1
We move all terms to the left:
2x-(21+3x+1)=0
We add all the numbers together, and all the variables
2x-(3x+22)=0
We get rid of parentheses
2x-3x-22=0
We add all the numbers together, and all the variables
-1x-22=0
We move all terms containing x to the left, all other terms to the right
-x=22
x=22/-1
x=-22
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