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4x-21=x+9
We move all terms to the left:
4x-21-(x+9)=0
We get rid of parentheses
4x-x-9-21=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10
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