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200x+400(2x)=15000
We move all terms to the left:
200x+400(2x)-(15000)=0
We add all the numbers together, and all the variables
4202x-15000=0
We move all terms containing x to the left, all other terms to the right
4202x=15000
x=15000/4202
x=3+1197/2101
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