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X+0.7X=300
We move all terms to the left:
X+0.7X-(300)=0
We add all the numbers together, and all the variables
1.7X-300=0
We move all terms containing X to the left, all other terms to the right
1.7X=300
X=300/1.7
X=176+0.80000000000001/1.7
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