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21x+6=7x+34
We move all terms to the left:
21x+6-(7x+34)=0
We get rid of parentheses
21x-7x-34+6=0
We add all the numbers together, and all the variables
14x-28=0
We move all terms containing x to the left, all other terms to the right
14x=28
x=28/14
x=2
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