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4x-600=2x+300
We move all terms to the left:
4x-600-(2x+300)=0
We get rid of parentheses
4x-2x-300-600=0
We add all the numbers together, and all the variables
2x-900=0
We move all terms containing x to the left, all other terms to the right
2x=900
x=900/2
x=450
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