-10(9k-9)=-10(9+7k)

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Solution for -10(9k-9)=-10(9+7k) equation: 



-10(9k-9)=-10(9+7k)

We move all terms to the left:

-10(9k-9)-(-10(9+7k))=0

We add all the numbers together, and all the variables

-10(9k-9)-(-10(7k+9))=0

We multiply parentheses

-90k-(-10(7k+9))+90=0



We calculate terms in parentheses: -(-10(7k+9)), so:

-10(7k+9)

We multiply parentheses

-70k-90

Back to the equation:

-(-70k-90)



We get rid of parentheses

-90k+70k+90+90=0

We add all the numbers together, and all the variables

-20k+180=0

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

-20k=-180

k=-180/-20

k=+9

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