21-5k=-5(1+6k)-k

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Solution for 21-5k=-5(1+6k)-k equation: 



21-5k=-5(1+6k)-k

We move all terms to the left:

21-5k-(-5(1+6k)-k)=0

We add all the numbers together, and all the variables

-5k-(-5(6k+1)-k)+21=0



We calculate terms in parentheses: -(-5(6k+1)-k), so:

-5(6k+1)-k

We add all the numbers together, and all the variables

-1k-5(6k+1)

We multiply parentheses

-1k-30k-5

We add all the numbers together, and all the variables

-31k-5

Back to the equation:

-(-31k-5)



We get rid of parentheses

-5k+31k+5+21=0

We add all the numbers together, and all the variables

26k+26=0

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

26k=-26

k=-26/26

k=-1

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