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5x+21=x+45
We move all terms to the left:
5x+21-(x+45)=0
We get rid of parentheses
5x-x-45+21=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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