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0.9=x+8.1
We move all terms to the left:
0.9-(x+8.1)=0
We get rid of parentheses
-x-8.1+0.9=0
We add all the numbers together, and all the variables
-1x-7.2=0
We move all terms containing x to the left, all other terms to the right
-x=7.2
x=7.2/-1
x=-7+0.2/1
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