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2x+0.5x+0.25x+3=300
We move all terms to the left:
2x+0.5x+0.25x+3-(300)=0
We add all the numbers together, and all the variables
2.75x-297=0
We move all terms containing x to the left, all other terms to the right
2.75x=297
x=297/2.75
x=108
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