21=-3+4(k-9)

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Solution for 21=-3+4(k-9) equation: 


Simplifying
21 = -3 + 4(k + -9)

Reorder the terms:
21 = -3 + 4(-9 + k)
21 = -3 + (-9 * 4 + k * 4)
21 = -3 + (-36 + 4k)

Combine like terms: -3 + -36 = -39
21 = -39 + 4k

Solving
21 = -39 + 4k

Solving for variable 'k'.

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

Add '-4k' to each side of the equation.
21 + -4k = -39 + 4k + -4k

Combine like terms: 4k + -4k = 0
21 + -4k = -39 + 0
21 + -4k = -39

Add '-21' to each side of the equation.
21 + -21 + -4k = -39 + -21

Combine like terms: 21 + -21 = 0
0 + -4k = -39 + -21
-4k = -39 + -21

Combine like terms: -39 + -21 = -60
-4k = -60

Divide each side by '-4'.
k = 15

Simplifying
k = 15

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