3k=21-4k

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Solution for 3k=21-4k equation: 


Simplifying
3k = 21 + -4k

Solving
3k = 21 + -4k

Solving for variable 'k'.

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

Add '4k' to each side of the equation.
3k + 4k = 21 + -4k + 4k

Combine like terms: 3k + 4k = 7k
7k = 21 + -4k + 4k

Combine like terms: -4k + 4k = 0
7k = 21 + 0
7k = 21

Divide each side by '7'.
k = 3

Simplifying
k = 3

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