13=k-7

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Solution for 13=k-7 equation: 


Simplifying
13 = k + -7

Reorder the terms:
13 = -7 + k

Solving
13 = -7 + 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.
13 + -1k = -7 + k + -1k

Combine like terms: k + -1k = 0
13 + -1k = -7 + 0
13 + -1k = -7

Add '-13' to each side of the equation.
13 + -13 + -1k = -7 + -13

Combine like terms: 13 + -13 = 0
0 + -1k = -7 + -13
-1k = -7 + -13

Combine like terms: -7 + -13 = -20
-1k = -20

Divide each side by '-1'.
k = 20

Simplifying
k = 20

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