21=-7(-12+x)

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Solution for 21=-7(-12+x) equation: 



21=-7(-12+x)

We move all terms to the left:

21-(-7(-12+x))=0

We add all the numbers together, and all the variables

-(-7(x-12))+21=0



We calculate terms in parentheses: -(-7(x-12)), so:

-7(x-12)

We multiply parentheses

-7x+84

Back to the equation:

-(-7x+84)



We get rid of parentheses

7x-84+21=0

We add all the numbers together, and all the variables

7x-63=0

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

7x=63

x=63/7

x=9

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