3x-6x+21=x

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Solution for 3x-6x+21=x equation: 



3x-6x+21=x

We move all terms to the left:

3x-6x+21-(x)=0

We add all the numbers together, and all the variables

-4x+21=0

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

-4x=-21

x=-21/-4

x=5+1/4

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