k+4=21-x

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Solution for k+4=21-x equation: 


Simplifying
k + 4 = 21 + -1x

Reorder the terms:
4 + k = 21 + -1x

Solving
4 + k = 21 + -1x

Solving for variable 'k'.

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

Add '-4' to each side of the equation.
4 + -4 + k = 21 + -4 + -1x

Combine like terms: 4 + -4 = 0
0 + k = 21 + -4 + -1x
k = 21 + -4 + -1x

Combine like terms: 21 + -4 = 17
k = 17 + -1x

Simplifying
k = 17 + -1x

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