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20x=8x+450000
We move all terms to the left:
20x-(8x+450000)=0
We get rid of parentheses
20x-8x-450000=0
We add all the numbers together, and all the variables
12x-450000=0
We move all terms containing x to the left, all other terms to the right
12x=450000
x=450000/12
x=37500
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