4k-9k=b

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Solution for 4k-9k=b equation: 


Simplifying
4k + -9k = b

Combine like terms: 4k + -9k = -5k
-5k = b

Solving
-5k = b

Solving for variable 'k'.

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

Divide each side by '-5'.
k = -0.2b

Simplifying
k = -0.2b

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