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x+x+0.5x+0.25x=300
We move all terms to the left:
x+x+0.5x+0.25x-(300)=0
We add all the numbers together, and all the variables
2.75x-300=0
We move all terms containing x to the left, all other terms to the right
2.75x=300
x=300/2.75
x=109+0.25/2.75
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