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6x-21=2x+10
We move all terms to the left:
6x-21-(2x+10)=0
We get rid of parentheses
6x-2x-10-21=0
We add all the numbers together, and all the variables
4x-31=0
We move all terms containing x to the left, all other terms to the right
4x=31
x=31/4
x=7+3/4
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