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3x-14=21-x
We move all terms to the left:
3x-14-(21-x)=0
We add all the numbers together, and all the variables
3x-(-1x+21)-14=0
We get rid of parentheses
3x+1x-21-14=0
We add all the numbers together, and all the variables
4x-35=0
We move all terms containing x to the left, all other terms to the right
4x=35
x=35/4
x=8+3/4
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