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7500=20000-2500x
We move all terms to the left:
7500-(20000-2500x)=0
We add all the numbers together, and all the variables
-(-2500x+20000)+7500=0
We get rid of parentheses
2500x-20000+7500=0
We add all the numbers together, and all the variables
2500x-12500=0
We move all terms containing x to the left, all other terms to the right
2500x=12500
x=12500/2500
x=5
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