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x+1.9x=300
We move all terms to the left:
x+1.9x-(300)=0
We add all the numbers together, and all the variables
2.9x-300=0
We move all terms containing x to the left, all other terms to the right
2.9x=300
x=300/2.9
x=103+1/2.2307692307692
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