X*2-20=x

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Solution for X*2-20=x equation: 



X*2-20=X

We move all terms to the left:

X*2-20-(X)=0

We add all the numbers together, and all the variables

-1X+X*2-20=0

Wy multiply elements

-1X+2X-20=0

We add all the numbers together, and all the variables

X-20=0

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

X=20

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