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3.9x+0.7=8.66
We move all terms to the left:
3.9x+0.7-(8.66)=0
We add all the numbers together, and all the variables
3.9x-7.96=0
We move all terms containing x to the left, all other terms to the right
3.9x=7.96
x=7.96/3.9
x=2+0.16/3.9
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