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1000=-2129x+21028.35
We move all terms to the left:
1000-(-2129x+21028.35)=0
We get rid of parentheses
2129x-21028.35+1000=0
We add all the numbers together, and all the variables
2129x-20028.35=0
We move all terms containing x to the left, all other terms to the right
2129x=20028.35
x=20028.35/2129
x=9+642.481481482/1577.03703704
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