21=9-2k

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Solution for 21=9-2k equation:


Simplifying
21 = 9 + -2k

Solving
21 = 9 + -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 + 2k = 9 + -2k + 2k

Combine like terms: -2k + 2k = 0
21 + 2k = 9 + 0
21 + 2k = 9

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

Combine like terms: 21 + -21 = 0
0 + 2k = 9 + -21
2k = 9 + -21

Combine like terms: 9 + -21 = -12
2k = -12

Divide each side by '2'.
k = -6

Simplifying
k = -6

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