21+15=3x+k

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Solution for 21+15=3x+k equation:


Simplifying
21 + 15 = 3x + k

Combine like terms: 21 + 15 = 36
36 = 3x + k

Reorder the terms:
36 = k + 3x

Solving
36 = k + 3x

Solving for variable 'k'.

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

Add '-1k' to each side of the equation.
36 + -1k = k + -1k + 3x

Combine like terms: k + -1k = 0
36 + -1k = 0 + 3x
36 + -1k = 3x

Add '-36' to each side of the equation.
36 + -36 + -1k = -36 + 3x

Combine like terms: 36 + -36 = 0
0 + -1k = -36 + 3x
-1k = -36 + 3x

Divide each side by '-1'.
k = 36 + -3x

Simplifying
k = 36 + -3x

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