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2.1x-7.66=8.3
We move all terms to the left:
2.1x-7.66-(8.3)=0
We add all the numbers together, and all the variables
2.1x-15.96=0
We move all terms containing x to the left, all other terms to the right
2.1x=15.96
x=15.96/2.1
x=7+1/1.6666666666667
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