-81=4(3-5k)+7

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Solution for -81=4(3-5k)+7 equation: 



-81=4(3-5k)+7

We move all terms to the left:

-81-(4(3-5k)+7)=0

We add all the numbers together, and all the variables

-(4(-5k+3)+7)-81=0



We calculate terms in parentheses: -(4(-5k+3)+7), so:

4(-5k+3)+7

We multiply parentheses

-20k+12+7

We add all the numbers together, and all the variables

-20k+19

Back to the equation:

-(-20k+19)



We get rid of parentheses

20k-19-81=0

We add all the numbers together, and all the variables

20k-100=0

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

20k=100

k=100/20

k=5

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