x=-3^2+8x+21

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Solution for x=-3^2+8x+21 equation: 



x=-3^2+8x+21

We move all terms to the left:

x-(-3^2+8x+21)=0

We get rid of parentheses

x-8x-21+3^2=0

We add all the numbers together, and all the variables

-7x-12=0

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

-7x=12

x=12/-7

x=-1+5/7

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