8k-9=5k+21

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Solution for 8k-9=5k+21 equation:


Simplifying
8k + -9 = 5k + 21

Reorder the terms:
-9 + 8k = 5k + 21

Reorder the terms:
-9 + 8k = 21 + 5k

Solving
-9 + 8k = 21 + 5k

Solving for variable 'k'.

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

Add '-5k' to each side of the equation.
-9 + 8k + -5k = 21 + 5k + -5k

Combine like terms: 8k + -5k = 3k
-9 + 3k = 21 + 5k + -5k

Combine like terms: 5k + -5k = 0
-9 + 3k = 21 + 0
-9 + 3k = 21

Add '9' to each side of the equation.
-9 + 9 + 3k = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3k = 21 + 9
3k = 21 + 9

Combine like terms: 21 + 9 = 30
3k = 30

Divide each side by '3'.
k = 10

Simplifying
k = 10

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