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