21-2k=15

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Solution for 21-2k=15 equation: 


Simplifying
21 + -2k = 15

Solving
21 + -2k = 15

Solving for variable 'k'.

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

Add '-21' to each side of the equation.
21 + -21 + -2k = 15 + -21

Combine like terms: 21 + -21 = 0
0 + -2k = 15 + -21
-2k = 15 + -21

Combine like terms: 15 + -21 = -6
-2k = -6

Divide each side by '-2'.
k = 3

Simplifying
k = 3

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