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X+X*7=16000
We move all terms to the left:
X+X*7-(16000)=0
Wy multiply elements
X+7X-16000=0
We add all the numbers together, and all the variables
8X-16000=0
We move all terms containing X to the left, all other terms to the right
8X=16000
X=16000/8
X=2000
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