-21=-7x+7(3x-15)

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Solution for -21=-7x+7(3x-15) equation: 



-21=-7x+7(3x-15)

We move all terms to the left:

-21-(-7x+7(3x-15))=0



We calculate terms in parentheses: -(-7x+7(3x-15)), so:

-7x+7(3x-15)

We multiply parentheses

-7x+21x-105

We add all the numbers together, and all the variables

14x-105

Back to the equation:

-(14x-105)



We get rid of parentheses

-14x+105-21=0

We add all the numbers together, and all the variables

-14x+84=0

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

-14x=-84

x=-84/-14

x=+6

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