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8.6x+3.1=20.3
We move all terms to the left:
8.6x+3.1-(20.3)=0
We add all the numbers together, and all the variables
8.6x-17.2=0
We move all terms containing x to the left, all other terms to the right
8.6x=17.2
x=17.2/8.6
x=2
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