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21+x=0.5x+1
We move all terms to the left:
21+x-(0.5x+1)=0
We get rid of parentheses
x-0.5x-1+21=0
We add all the numbers together, and all the variables
0.5x+20=0
We move all terms containing x to the left, all other terms to the right
0.5x=-20
x=-20/0.5
x=-40
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