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1050=x-21000
We move all terms to the left:
1050-(x-21000)=0
We get rid of parentheses
-x+21000+1050=0
We add all the numbers together, and all the variables
-1x+22050=0
We move all terms containing x to the left, all other terms to the right
-x=-22050
x=-22050/-1
x=+22050
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