9k-7-5k=21

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Solution for 9k-7-5k=21 equation: 


Simplifying
9k + -7 + -5k = 21

Reorder the terms:
-7 + 9k + -5k = 21

Combine like terms: 9k + -5k = 4k
-7 + 4k = 21

Solving
-7 + 4k = 21

Solving for variable 'k'.

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

Add '7' to each side of the equation.
-7 + 7 + 4k = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 4k = 21 + 7
4k = 21 + 7

Combine like terms: 21 + 7 = 28
4k = 28

Divide each side by '4'.
k = 7

Simplifying
k = 7

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