-21=4(7k-3)

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Solution for -21=4(7k-3) equation: 



-21=4(7k-3)

We move all terms to the left:

-21-(4(7k-3))=0



We calculate terms in parentheses: -(4(7k-3)), so:

4(7k-3)

We multiply parentheses

28k-12

Back to the equation:

-(28k-12)



We get rid of parentheses

-28k+12-21=0

We add all the numbers together, and all the variables

-28k-9=0

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

-28k=9

k=9/-28

k=-9/28

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