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1500=3500-x
We move all terms to the left:
1500-(3500-x)=0
We add all the numbers together, and all the variables
-(-1x+3500)+1500=0
We get rid of parentheses
1x-3500+1500=0
We add all the numbers together, and all the variables
x-2000=0
We move all terms containing x to the left, all other terms to the right
x=2000
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