-126=7(-3-3k)

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Solution for -126=7(-3-3k) equation: 



-126=7(-3-3k)

We move all terms to the left:

-126-(7(-3-3k))=0

We add all the numbers together, and all the variables

-(7(-3k-3))-126=0



We calculate terms in parentheses: -(7(-3k-3)), so:

7(-3k-3)

We multiply parentheses

-21k-21

Back to the equation:

-(-21k-21)



We get rid of parentheses

21k+21-126=0

We add all the numbers together, and all the variables

21k-105=0

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

21k=105

k=105/21

k=5

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