21=-3+(k-9)

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Solution for 21=-3+(k-9) equation: 


Simplifying
21 = -3 + (k + -9)

Reorder the terms:
21 = -3 + (-9 + k)

Remove parenthesis around (-9 + k)
21 = -3 + -9 + k

Combine like terms: -3 + -9 = -12
21 = -12 + k

Solving
21 = -12 + k

Solving for variable 'k'.

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

Add '-1k' to each side of the equation.
21 + -1k = -12 + k + -1k

Combine like terms: k + -1k = 0
21 + -1k = -12 + 0
21 + -1k = -12

Add '-21' to each side of the equation.
21 + -21 + -1k = -12 + -21

Combine like terms: 21 + -21 = 0
0 + -1k = -12 + -21
-1k = -12 + -21

Combine like terms: -12 + -21 = -33
-1k = -33

Divide each side by '-1'.
k = 33

Simplifying
k = 33

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