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1000-800x=2000+200x
We move all terms to the left:
1000-800x-(2000+200x)=0
We add all the numbers together, and all the variables
-800x-(200x+2000)+1000=0
We get rid of parentheses
-800x-200x-2000+1000=0
We add all the numbers together, and all the variables
-1000x-1000=0
We move all terms containing x to the left, all other terms to the right
-1000x=1000
x=1000/-1000
x=-1
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