8x+3.9=21x

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Solution for 8x+3.9=21x equation: 



8x+3.9=21x

We move all terms to the left:

8x+3.9-(21x)=0

We add all the numbers together, and all the variables

-13x+3.9=0

We move all terms containing x to the left, all other terms to the right

-13x=-3.9

x=-3.9/-13

x=2.0526315789474/6.8421052631579

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