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11x-3=7x+21
We move all terms to the left:
11x-3-(7x+21)=0
We get rid of parentheses
11x-7x-21-3=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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