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3000=10000-x
We move all terms to the left:
3000-(10000-x)=0
We add all the numbers together, and all the variables
-(-1x+10000)+3000=0
We get rid of parentheses
1x-10000+3000=0
We add all the numbers together, and all the variables
x-7000=0
We move all terms containing x to the left, all other terms to the right
x=7000
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