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13.1x+0.7x=8.2
We move all terms to the left:
13.1x+0.7x-(8.2)=0
We add all the numbers together, and all the variables
13.8x-8.2=0
We move all terms containing x to the left, all other terms to the right
13.8x=8.2
x=8.2/13.8
x=6.8333333333333/11.5
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