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3000=21000+.025x
We move all terms to the left:
3000-(21000+.025x)=0
We add all the numbers together, and all the variables
-(.025x+21000)+3000=0
We get rid of parentheses
-.025x-21000+3000=0
We add all the numbers together, and all the variables
-0.025x-18000=0
We move all terms containing x to the left, all other terms to the right
-0.025x=18000
x=18000/-0.025
x=-720000
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