-90=-6+3(7-7x)

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Solution for -90=-6+3(7-7x) equation: 



-90=-6+3(7-7x)

We move all terms to the left:

-90-(-6+3(7-7x))=0

We add all the numbers together, and all the variables

-(-6+3(-7x+7))-90=0



We calculate terms in parentheses: -(-6+3(-7x+7)), so:

-6+3(-7x+7)

determiningTheFunctionDomain
3(-7x+7)-6

We multiply parentheses

-21x+21-6

We add all the numbers together, and all the variables

-21x+15

Back to the equation:

-(-21x+15)



We get rid of parentheses

21x-15-90=0

We add all the numbers together, and all the variables

21x-105=0

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

21x=105

x=105/21

x=5

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