-9x+21=8(x+9)

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Solution for -9x+21=8(x+9) equation: 



-9x+21=8(x+9)

We move all terms to the left:

-9x+21-(8(x+9))=0



We calculate terms in parentheses: -(8(x+9)), so:

8(x+9)

We multiply parentheses

8x+72

Back to the equation:

-(8x+72)



We get rid of parentheses

-9x-8x-72+21=0

We add all the numbers together, and all the variables

-17x-51=0

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

-17x=51

x=51/-17

x=-3

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