-21=5k+2k

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Solution for -21=5k+2k equation:


Simplifying
-21 = 5k + 2k

Combine like terms: 5k + 2k = 7k
-21 = 7k

Solving
-21 = 7k

Solving for variable 'k'.

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

Add '-7k' to each side of the equation.
-21 + -7k = 7k + -7k

Combine like terms: 7k + -7k = 0
-21 + -7k = 0

Add '21' to each side of the equation.
-21 + 21 + -7k = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -7k = 0 + 21
-7k = 0 + 21

Combine like terms: 0 + 21 = 21
-7k = 21

Divide each side by '-7'.
k = -3

Simplifying
k = -3

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