21+7k=-5(8k+4)

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Solution for 21+7k=-5(8k+4) equation:


Simplifying
21 + 7k = -5(8k + 4)

Reorder the terms:
21 + 7k = -5(4 + 8k)
21 + 7k = (4 * -5 + 8k * -5)
21 + 7k = (-20 + -40k)

Solving
21 + 7k = -20 + -40k

Solving for variable 'k'.

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

Add '40k' to each side of the equation.
21 + 7k + 40k = -20 + -40k + 40k

Combine like terms: 7k + 40k = 47k
21 + 47k = -20 + -40k + 40k

Combine like terms: -40k + 40k = 0
21 + 47k = -20 + 0
21 + 47k = -20

Add '-21' to each side of the equation.
21 + -21 + 47k = -20 + -21

Combine like terms: 21 + -21 = 0
0 + 47k = -20 + -21
47k = -20 + -21

Combine like terms: -20 + -21 = -41
47k = -41

Divide each side by '47'.
k = -0.8723404255

Simplifying
k = -0.8723404255

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