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6x-21=51+3x
We move all terms to the left:
6x-21-(51+3x)=0
We add all the numbers together, and all the variables
6x-(3x+51)-21=0
We get rid of parentheses
6x-3x-51-21=0
We add all the numbers together, and all the variables
3x-72=0
We move all terms containing x to the left, all other terms to the right
3x=72
x=72/3
x=24
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