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x+2.7x=100
We move all terms to the left:
x+2.7x-(100)=0
We add all the numbers together, and all the variables
3.7x-100=0
We move all terms containing x to the left, all other terms to the right
3.7x=100
x=100/3.7
x=27+0.099999999999994/3.7
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