-21=6u+3(u+2)

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Solution for -21=6u+3(u+2) equation:


Simplifying
-21 = 6u + 3(u + 2)

Reorder the terms:
-21 = 6u + 3(2 + u)
-21 = 6u + (2 * 3 + u * 3)
-21 = 6u + (6 + 3u)

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

Combine like terms: 6u + 3u = 9u
-21 = 6 + 9u

Solving
-21 = 6 + 9u

Solving for variable 'u'.

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

Add '-9u' to each side of the equation.
-21 + -9u = 6 + 9u + -9u

Combine like terms: 9u + -9u = 0
-21 + -9u = 6 + 0
-21 + -9u = 6

Add '21' to each side of the equation.
-21 + 21 + -9u = 6 + 21

Combine like terms: -21 + 21 = 0
0 + -9u = 6 + 21
-9u = 6 + 21

Combine like terms: 6 + 21 = 27
-9u = 27

Divide each side by '-9'.
u = -3

Simplifying
u = -3

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