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0.9x+8.1=-0.1x+1
We move all terms to the left:
0.9x+8.1-(-0.1x+1)=0
We get rid of parentheses
0.9x+0.1x-1+8.1=0
We add all the numbers together, and all the variables
x+7.1=0
We move all terms containing x to the left, all other terms to the right
x=-7.1
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