21-13=-2k+4(5+2k)

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Solution for 21-13=-2k+4(5+2k) equation: 



21-13=-2k+4(5+2k)

We move all terms to the left:

21-13-(-2k+4(5+2k))=0

We add all the numbers together, and all the variables

-(-2k+4(2k+5))+21-13=0

We add all the numbers together, and all the variables

-(-2k+4(2k+5))+8=0



We calculate terms in parentheses: -(-2k+4(2k+5)), so:

-2k+4(2k+5)

We multiply parentheses

-2k+8k+20

We add all the numbers together, and all the variables

6k+20

Back to the equation:

-(6k+20)



We get rid of parentheses

-6k-20+8=0

We add all the numbers together, and all the variables

-6k-12=0

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

-6k=12

k=12/-6

k=-2

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