21+7k=-2(5k-4)

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Solution for 21+7k=-2(5k-4) equation:


Simplifying
21 + 7k = -2(5k + -4)

Reorder the terms:
21 + 7k = -2(-4 + 5k)
21 + 7k = (-4 * -2 + 5k * -2)
21 + 7k = (8 + -10k)

Solving
21 + 7k = 8 + -10k

Solving for variable 'k'.

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

Add '10k' to each side of the equation.
21 + 7k + 10k = 8 + -10k + 10k

Combine like terms: 7k + 10k = 17k
21 + 17k = 8 + -10k + 10k

Combine like terms: -10k + 10k = 0
21 + 17k = 8 + 0
21 + 17k = 8

Add '-21' to each side of the equation.
21 + -21 + 17k = 8 + -21

Combine like terms: 21 + -21 = 0
0 + 17k = 8 + -21
17k = 8 + -21

Combine like terms: 8 + -21 = -13
17k = -13

Divide each side by '17'.
k = -0.7647058824

Simplifying
k = -0.7647058824

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