13=31-k

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Solution for 13=31-k equation:


Simplifying
13 = 31 + -1k

Solving
13 = 31 + -1k

Solving for variable 'k'.

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

Add 'k' to each side of the equation.
13 + k = 31 + -1k + k

Combine like terms: -1k + k = 0
13 + k = 31 + 0
13 + k = 31

Add '-13' to each side of the equation.
13 + -13 + k = 31 + -13

Combine like terms: 13 + -13 = 0
0 + k = 31 + -13
k = 31 + -13

Combine like terms: 31 + -13 = 18
k = 18

Simplifying
k = 18

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