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2(39000+1350x)=21000+450x
We move all terms to the left:
2(39000+1350x)-(21000+450x)=0
We add all the numbers together, and all the variables
2(1350x+39000)-(450x+21000)=0
We multiply parentheses
2700x-(450x+21000)+78000=0
We get rid of parentheses
2700x-450x-21000+78000=0
We add all the numbers together, and all the variables
2250x+57000=0
We move all terms containing x to the left, all other terms to the right
2250x=-57000
x=-57000/2250
x=-25+1/3
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