1k+21=15+7k

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Solution for 1k+21=15+7k equation: 



1k+21=15+7k

We move all terms to the left:

1k+21-(15+7k)=0

We add all the numbers together, and all the variables

1k-(7k+15)+21=0

We add all the numbers together, and all the variables

k-(7k+15)+21=0

We get rid of parentheses

k-7k-15+21=0

We add all the numbers together, and all the variables

-6k+6=0

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

-6k=-6

k=-6/-6

k=1

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