x=-6^2+8x-6+21

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Solution for x=-6^2+8x-6+21 equation: 



x=-6^2+8x-6+21

We move all terms to the left:

x-(-6^2+8x-6+21)=0

We get rid of parentheses

x-8x+6-21+6^2=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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