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7000=3000+x
We move all terms to the left:
7000-(3000+x)=0
We add all the numbers together, and all the variables
-(x+3000)+7000=0
We get rid of parentheses
-x-3000+7000=0
We add all the numbers together, and all the variables
-1x+4000=0
We move all terms containing x to the left, all other terms to the right
-x=-4000
x=-4000/-1
x=+4000
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