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10x+1=5x+21
We move all terms to the left:
10x+1-(5x+21)=0
We get rid of parentheses
10x-5x-21+1=0
We add all the numbers together, and all the variables
5x-20=0
We move all terms containing x to the left, all other terms to the right
5x=20
x=20/5
x=4
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