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11x-3=8x+21
We move all terms to the left:
11x-3-(8x+21)=0
We get rid of parentheses
11x-8x-21-3=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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