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2x=450-x
We move all terms to the left:
2x-(450-x)=0
We add all the numbers together, and all the variables
2x-(-1x+450)=0
We get rid of parentheses
2x+1x-450=0
We add all the numbers together, and all the variables
3x-450=0
We move all terms containing x to the left, all other terms to the right
3x=450
x=450/3
x=150
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