3k+5k=-21

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Solution for 3k+5k=-21 equation: 


Simplifying
3k + 5k = -21

Combine like terms: 3k + 5k = 8k
8k = -21

Solving
8k = -21

Solving for variable 'k'.

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

Divide each side by '8'.
k = -2.625

Simplifying
k = -2.625

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