-3k-7k=-20

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Solution for -3k-7k=-20 equation: 


Simplifying
-3k + -7k = -20

Combine like terms: -3k + -7k = -10k
-10k = -20

Solving
-10k = -20

Solving for variable 'k'.

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

Divide each side by '-10'.
k = 2

Simplifying
k = 2

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