3+k=21

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Solution for 3+k=21 equation: 


Simplifying
3 + k = 21

Solving
3 + k = 21

Solving for variable 'k'.

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

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

Combine like terms: 3 + -3 = 0
0 + k = 21 + -3
k = 21 + -3

Combine like terms: 21 + -3 = 18
k = 18

Simplifying
k = 18

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