2k-8-7k=21

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Solution for 2k-8-7k=21 equation:


Simplifying
2k + -8 + -7k = 21

Reorder the terms:
-8 + 2k + -7k = 21

Combine like terms: 2k + -7k = -5k
-8 + -5k = 21

Solving
-8 + -5k = 21

Solving for variable 'k'.

Move all terms containing k to the left, all other terms to the right.

Add '8' to each side of the equation.
-8 + 8 + -5k = 21 + 8

Combine like terms: -8 + 8 = 0
0 + -5k = 21 + 8
-5k = 21 + 8

Combine like terms: 21 + 8 = 29
-5k = 29

Divide each side by '-5'.
k = -5.8

Simplifying
k = -5.8

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