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

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



-81=3(k-7)+7k
We move all terms to the left:
-81-(3(k-7)+7k)=0
We calculate terms in parentheses: -(3(k-7)+7k), so:
3(k-7)+7k
We add all the numbers together, and all the variables
7k+3(k-7)
We multiply parentheses
7k+3k-21
We add all the numbers together, and all the variables
10k-21
Back to the equation:
-(10k-21)
We get rid of parentheses
-10k+21-81=0
We add all the numbers together, and all the variables
-10k-60=0
We move all terms containing k to the left, all other terms to the right
-10k=60
k=60/-10
k=-6

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