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x+x+0.20=16.5
We move all terms to the left:
x+x+0.20-(16.5)=0
We add all the numbers together, and all the variables
2x-16.3=0
We move all terms containing x to the left, all other terms to the right
2x=16.3
x=16.3/2
x=8+0.3/2
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