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

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


Simplifying
6u + 21 = -3(u + 5)

Reorder the terms:
21 + 6u = -3(u + 5)

Reorder the terms:
21 + 6u = -3(5 + u)
21 + 6u = (5 * -3 + u * -3)
21 + 6u = (-15 + -3u)

Solving
21 + 6u = -15 + -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 + 6u + 3u = -15 + -3u + 3u

Combine like terms: 6u + 3u = 9u
21 + 9u = -15 + -3u + 3u

Combine like terms: -3u + 3u = 0
21 + 9u = -15 + 0
21 + 9u = -15

Add '-21' to each side of the equation.
21 + -21 + 9u = -15 + -21

Combine like terms: 21 + -21 = 0
0 + 9u = -15 + -21
9u = -15 + -21

Combine like terms: -15 + -21 = -36
9u = -36

Divide each side by '9'.
u = -4

Simplifying
u = -4

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