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5x-5=2x+21
We move all terms to the left:
5x-5-(2x+21)=0
We get rid of parentheses
5x-2x-21-5=0
We add all the numbers together, and all the variables
3x-26=0
We move all terms containing x to the left, all other terms to the right
3x=26
x=26/3
x=8+2/3
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