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5x-21=3x-13
We move all terms to the left:
5x-21-(3x-13)=0
We get rid of parentheses
5x-3x+13-21=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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