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0.8x+6.7=13.1
We move all terms to the left:
0.8x+6.7-(13.1)=0
We add all the numbers together, and all the variables
0.8x-6.4=0
We move all terms containing x to the left, all other terms to the right
0.8x=6.4
x=6.4/0.8
x=8
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