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3x+16=x+21
We move all terms to the left:
3x+16-(x+21)=0
We get rid of parentheses
3x-x-21+16=0
We add all the numbers together, and all the variables
2x-5=0
We move all terms containing x to the left, all other terms to the right
2x=5
x=5/2
x=2+1/2
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