x.x=4x+21

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Solution for x.x=4x+21 equation: 



x.x=4x+21

We move all terms to the left:

x.x-(4x+21)=0

We get rid of parentheses

x.x-4x-21=0

We add all the numbers together, and all the variables

-4x+x.x-21=0

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

-4x+x.x=21

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