40=9+k

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Solution for 40=9+k equation:


Simplifying
40 = 9 + k

Solving
40 = 9 + 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.
40 + -1k = 9 + k + -1k

Combine like terms: k + -1k = 0
40 + -1k = 9 + 0
40 + -1k = 9

Add '-40' to each side of the equation.
40 + -40 + -1k = 9 + -40

Combine like terms: 40 + -40 = 0
0 + -1k = 9 + -40
-1k = 9 + -40

Combine like terms: 9 + -40 = -31
-1k = -31

Divide each side by '-1'.
k = 31

Simplifying
k = 31

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