21-6k=3+6(-1-2k)

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Solution for 21-6k=3+6(-1-2k) equation: 



21-6k=3+6(-1-2k)

We move all terms to the left:

21-6k-(3+6(-1-2k))=0

We add all the numbers together, and all the variables

-6k-(3+6(-2k-1))+21=0



We calculate terms in parentheses: -(3+6(-2k-1)), so:

3+6(-2k-1)

determiningTheFunctionDomain
6(-2k-1)+3

We multiply parentheses

-12k-6+3

We add all the numbers together, and all the variables

-12k-3

Back to the equation:

-(-12k-3)



We get rid of parentheses

-6k+12k+3+21=0

We add all the numbers together, and all the variables

6k+24=0

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

6k=-24

k=-24/6

k=-4

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