3x+21=39x

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Solution for 3x+21=39x equation: 



3x+21=39x

We move all terms to the left:

3x+21-(39x)=0

We add all the numbers together, and all the variables

-36x+21=0

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

-36x=-21

x=-21/-36

x=7/12

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