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102.89=0.10x+2.89
We move all terms to the left:
102.89-(0.10x+2.89)=0
We get rid of parentheses
-0.10x-2.89+102.89=0
We add all the numbers together, and all the variables
-0.1x+100=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-100
x=-100/-0.1
x=+1000
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