7(8+k)=21

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Solution for 7(8+k)=21 equation: 


Simplifying
7(8 + k) = 21
(8 * 7 + k * 7) = 21
(56 + 7k) = 21

Solving
56 + 7k = 21

Solving for variable 'k'.

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

Add '-56' to each side of the equation.
56 + -56 + 7k = 21 + -56

Combine like terms: 56 + -56 = 0
0 + 7k = 21 + -56
7k = 21 + -56

Combine like terms: 21 + -56 = -35
7k = -35

Divide each side by '7'.
k = -5

Simplifying
k = -5

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