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3x+7=2x+21.
We move all terms to the left:
3x+7-(2x+21.)=0
We add all the numbers together, and all the variables
3x-(2x+21)+7=0
We get rid of parentheses
3x-2x-21+7=0
We add all the numbers together, and all the variables
x-14=0
We move all terms containing x to the left, all other terms to the right
x=14
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