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4.2x-8.2=8.6
We move all terms to the left:
4.2x-8.2-(8.6)=0
We add all the numbers together, and all the variables
4.2x-16.8=0
We move all terms containing x to the left, all other terms to the right
4.2x=16.8
x=16.8/4.2
x=4
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