3+k=21+3k

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


Simplifying
3 + k = 21 + 3k

Solving
3 + k = 21 + 3k

Solving for variable 'k'.

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

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

Combine like terms: k + -3k = -2k
3 + -2k = 21 + 3k + -3k

Combine like terms: 3k + -3k = 0
3 + -2k = 21 + 0
3 + -2k = 21

Add '-3' to each side of the equation.
3 + -3 + -2k = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -2k = 21 + -3
-2k = 21 + -3

Combine like terms: 21 + -3 = 18
-2k = 18

Divide each side by '-2'.
k = -9

Simplifying
k = -9

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