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7x+21=23+6x
We move all terms to the left:
7x+21-(23+6x)=0
We add all the numbers together, and all the variables
7x-(6x+23)+21=0
We get rid of parentheses
7x-6x-23+21=0
We add all the numbers together, and all the variables
x-2=0
We move all terms containing x to the left, all other terms to the right
x=2
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