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x+2x+0.5x=258300
We move all terms to the left:
x+2x+0.5x-(258300)=0
We add all the numbers together, and all the variables
3.5x-258300=0
We move all terms containing x to the left, all other terms to the right
3.5x=258300
x=258300/3.5
x=73800
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