-12 = 3 - 2k - Зk I also have to show work :’)

3

-12 = 3-5X
-12 X = 3+12
5X= 15
X=3

k =3

Explanation:

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.