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8x-(3x+21)=14
We move all terms to the left:
8x-(3x+21)-(14)=0
We get rid of parentheses
8x-3x-21-14=0
We add all the numbers together, and all the variables
5x-35=0
We move all terms containing x to the left, all other terms to the right
5x=35
x=35/5
x=7
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