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9x+21=5x+105
We move all terms to the left:
9x+21-(5x+105)=0
We get rid of parentheses
9x-5x-105+21=0
We add all the numbers together, and all the variables
4x-84=0
We move all terms containing x to the left, all other terms to the right
4x=84
x=84/4
x=21
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