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21x+29=42x+22
We move all terms to the left:
21x+29-(42x+22)=0
We get rid of parentheses
21x-42x-22+29=0
We add all the numbers together, and all the variables
-21x+7=0
We move all terms containing x to the left, all other terms to the right
-21x=-7
x=-7/-21
x=1/3
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