3=12+k

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Solution for 3=12+k equation:


Simplifying
3 = 12 + k

Solving
3 = 12 + k

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.
3 + -1k = 12 + k + -1k

Combine like terms: k + -1k = 0
3 + -1k = 12 + 0
3 + -1k = 12

Add '-3' to each side of the equation.
3 + -3 + -1k = 12 + -3

Combine like terms: 3 + -3 = 0
0 + -1k = 12 + -3
-1k = 12 + -3

Combine like terms: 12 + -3 = 9
-1k = 9

Divide each side by '-1'.
k = -9

Simplifying
k = -9

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