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300x=180x+31200
We move all terms to the left:
300x-(180x+31200)=0
We get rid of parentheses
300x-180x-31200=0
We add all the numbers together, and all the variables
120x-31200=0
We move all terms containing x to the left, all other terms to the right
120x=31200
x=31200/120
x=260
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