21=-6u+3(u+6)

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


Simplifying
21 = -6u + 3(u + 6)

Reorder the terms:
21 = -6u + 3(6 + u)
21 = -6u + (6 * 3 + u * 3)
21 = -6u + (18 + 3u)

Reorder the terms:
21 = 18 + -6u + 3u

Combine like terms: -6u + 3u = -3u
21 = 18 + -3u

Solving
21 = 18 + -3u

Solving for variable 'u'.

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

Add '3u' to each side of the equation.
21 + 3u = 18 + -3u + 3u

Combine like terms: -3u + 3u = 0
21 + 3u = 18 + 0
21 + 3u = 18

Add '-21' to each side of the equation.
21 + -21 + 3u = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 3u = 18 + -21
3u = 18 + -21

Combine like terms: 18 + -21 = -3
3u = -3

Divide each side by '3'.
u = -1

Simplifying
u = -1

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