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3x+21=x+10
We move all terms to the left:
3x+21-(x+10)=0
We get rid of parentheses
3x-x-10+21=0
We add all the numbers together, and all the variables
2x+11=0
We move all terms containing x to the left, all other terms to the right
2x=-11
x=-11/2
x=-5+1/2
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