-3(5+k)=-21

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Solution for -3(5+k)=-21 equation: 


Simplifying
-3(5 + k) = -21
(5 * -3 + k * -3) = -21
(-15 + -3k) = -21

Solving
-15 + -3k = -21

Solving for variable 'k'.

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

Add '15' to each side of the equation.
-15 + 15 + -3k = -21 + 15

Combine like terms: -15 + 15 = 0
0 + -3k = -21 + 15
-3k = -21 + 15

Combine like terms: -21 + 15 = -6
-3k = -6

Divide each side by '-3'.
k = 2

Simplifying
k = 2

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