-81=7x+6(-2x-21)

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Solution for -81=7x+6(-2x-21) equation: 



-81=7x+6(-2x-21)

We move all terms to the left:

-81-(7x+6(-2x-21))=0



We calculate terms in parentheses: -(7x+6(-2x-21)), so:

7x+6(-2x-21)

We multiply parentheses

7x-12x-126

We add all the numbers together, and all the variables

-5x-126

Back to the equation:

-(-5x-126)



We get rid of parentheses

5x+126-81=0

We add all the numbers together, and all the variables

5x+45=0

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

5x=-45

x=-45/5

x=-9

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