-90=7x-6(5x-21)

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Solution for -90=7x-6(5x-21) equation: 



-90=7x-6(5x-21)

We move all terms to the left:

-90-(7x-6(5x-21))=0



We calculate terms in parentheses: -(7x-6(5x-21)), so:

7x-6(5x-21)

We multiply parentheses

7x-30x+126

We add all the numbers together, and all the variables

-23x+126

Back to the equation:

-(-23x+126)



We get rid of parentheses

23x-126-90=0

We add all the numbers together, and all the variables

23x-216=0

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

23x=216

x=216/23

x=9+9/23

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