-140=-4(7k-7)

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Solution for -140=-4(7k-7) equation: 



-140=-4(7k-7)

We move all terms to the left:

-140-(-4(7k-7))=0



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

-4(7k-7)

We multiply parentheses

-28k+28

Back to the equation:

-(-28k+28)



We get rid of parentheses

28k-28-140=0

We add all the numbers together, and all the variables

28k-168=0

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

28k=168

k=168/28

k=6

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