15=5(-k-8)

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Solution for 15=5(-k-8) equation:


Simplifying
15 = 5(-1k + -8)

Reorder the terms:
15 = 5(-8 + -1k)
15 = (-8 * 5 + -1k * 5)
15 = (-40 + -5k)

Solving
15 = -40 + -5k

Solving for variable 'k'.

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

Add '5k' to each side of the equation.
15 + 5k = -40 + -5k + 5k

Combine like terms: -5k + 5k = 0
15 + 5k = -40 + 0
15 + 5k = -40

Add '-15' to each side of the equation.
15 + -15 + 5k = -40 + -15

Combine like terms: 15 + -15 = 0
0 + 5k = -40 + -15
5k = -40 + -15

Combine like terms: -40 + -15 = -55
5k = -55

Divide each side by '5'.
k = -11

Simplifying
k = -11

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