21=k-(-8)

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Solution for 21=k-(-8) equation:


Simplifying
21 = k + -1(-8)

Multiply -1 * -8
21 = k + 8

Reorder the terms:
21 = 8 + k

Solving
21 = 8 + 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 = 8 + k + -1k

Combine like terms: k + -1k = 0
21 + -1k = 8 + 0
21 + -1k = 8

Add '-21' to each side of the equation.
21 + -21 + -1k = 8 + -21

Combine like terms: 21 + -21 = 0
0 + -1k = 8 + -21
-1k = 8 + -21

Combine like terms: 8 + -21 = -13
-1k = -13

Divide each side by '-1'.
k = 13

Simplifying
k = 13

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