Question

How do you solve `25 = 7 + 3k- 12`?

Answer 1

`k=10`

Explanation:

`25=7+3k-12`

or

`3k-5=25`

or

`3k=25+5`

or

`3k=30`

or

`k=30/3`

or

`k=10`

Answer 2

k = 10

Explanation:

Write the equation as follows, so that the k term is on the left side.

`3k+7-12=25rArr3k-5=25`

add 5 to both sides to isolate k term on left.

`rArr3k-cancel(5)+cancel(5)=25+5rArr3k=30`

now divide both sides by 3 to obtain k.

`(cancel(3)^1 k)/cancel(3)^1=cancel(30)^10/cancel(3)^1rArrk=10`