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3.1=x-8.7
We move all terms to the left:
3.1-(x-8.7)=0
We get rid of parentheses
-x+8.7+3.1=0
We add all the numbers together, and all the variables
-1x+11.8=0
We move all terms containing x to the left, all other terms to the right
-x=-11.8
x=-11.8/-1
x=11+0.8/1
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