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6x-51=3x-21
We move all terms to the left:
6x-51-(3x-21)=0
We get rid of parentheses
6x-3x+21-51=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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