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0.1x+x=400
We move all terms to the left:
0.1x+x-(400)=0
We add all the numbers together, and all the variables
1.1x-400=0
We move all terms containing x to the left, all other terms to the right
1.1x=400
x=400/1.1
x=363+0.69999999999999/1.1
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