9k-21=2k+21

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Solution for 9k-21=2k+21 equation:


Simplifying
9k + -21 = 2k + 21

Reorder the terms:
-21 + 9k = 2k + 21

Reorder the terms:
-21 + 9k = 21 + 2k

Solving
-21 + 9k = 21 + 2k

Solving for variable 'k'.

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

Add '-2k' to each side of the equation.
-21 + 9k + -2k = 21 + 2k + -2k

Combine like terms: 9k + -2k = 7k
-21 + 7k = 21 + 2k + -2k

Combine like terms: 2k + -2k = 0
-21 + 7k = 21 + 0
-21 + 7k = 21

Add '21' to each side of the equation.
-21 + 21 + 7k = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 7k = 21 + 21
7k = 21 + 21

Combine like terms: 21 + 21 = 42
7k = 42

Divide each side by '7'.
k = 6

Simplifying
k = 6

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