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5x+21=2x+38
We move all terms to the left:
5x+21-(2x+38)=0
We get rid of parentheses
5x-2x-38+21=0
We add all the numbers together, and all the variables
3x-17=0
We move all terms containing x to the left, all other terms to the right
3x=17
x=17/3
x=5+2/3
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