30=k-(-9)

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Solution for 30=k-(-9) equation:


Simplifying
30 = k + -1(-9)

Multiply -1 * -9
30 = k + 9

Reorder the terms:
30 = 9 + k

Solving
30 = 9 + 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.
30 + -1k = 9 + k + -1k

Combine like terms: k + -1k = 0
30 + -1k = 9 + 0
30 + -1k = 9

Add '-30' to each side of the equation.
30 + -30 + -1k = 9 + -30

Combine like terms: 30 + -30 = 0
0 + -1k = 9 + -30
-1k = 9 + -30

Combine like terms: 9 + -30 = -21
-1k = -21

Divide each side by '-1'.
k = 21

Simplifying
k = 21

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