-21+6k=3k+3(5+5k)

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Solution for -21+6k=3k+3(5+5k) equation:


Simplifying
-21 + 6k = 3k + 3(5 + 5k)
-21 + 6k = 3k + (5 * 3 + 5k * 3)
-21 + 6k = 3k + (15 + 15k)

Reorder the terms:
-21 + 6k = 15 + 3k + 15k

Combine like terms: 3k + 15k = 18k
-21 + 6k = 15 + 18k

Solving
-21 + 6k = 15 + 18k

Solving for variable 'k'.

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

Add '-18k' to each side of the equation.
-21 + 6k + -18k = 15 + 18k + -18k

Combine like terms: 6k + -18k = -12k
-21 + -12k = 15 + 18k + -18k

Combine like terms: 18k + -18k = 0
-21 + -12k = 15 + 0
-21 + -12k = 15

Add '21' to each side of the equation.
-21 + 21 + -12k = 15 + 21

Combine like terms: -21 + 21 = 0
0 + -12k = 15 + 21
-12k = 15 + 21

Combine like terms: 15 + 21 = 36
-12k = 36

Divide each side by '-12'.
k = -3

Simplifying
k = -3

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