4k-2k=-20

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Solution for 4k-2k=-20 equation: 


Simplifying
4k + -2k = -20

Combine like terms: 4k + -2k = 2k
2k = -20

Solving
2k = -20

Solving for variable 'k'.

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

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

Simplifying
k = -10

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