21+21=3x+k

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


Simplifying
21 + 21 = 3x + k

Combine like terms: 21 + 21 = 42
42 = 3x + k

Reorder the terms:
42 = k + 3x

Solving
42 = 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.
42 + -1k = k + -1k + 3x

Combine like terms: k + -1k = 0
42 + -1k = 0 + 3x
42 + -1k = 3x

Add '-42' to each side of the equation.
42 + -42 + -1k = -42 + 3x

Combine like terms: 42 + -42 = 0
0 + -1k = -42 + 3x
-1k = -42 + 3x

Divide each side by '-1'.
k = 42 + -3x

Simplifying
k = 42 + -3x

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