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2500=x-0.1x-200
We move all terms to the left:
2500-(x-0.1x-200)=0
We add all the numbers together, and all the variables
-(0.9x-200)+2500=0
We get rid of parentheses
-0.9x+200+2500=0
We add all the numbers together, and all the variables
-0.9x+2700=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-2700
x=-2700/-0.9
x=+3000
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