3u+21=

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Solution for 3u+21= equation: 


Simplifying
3u + 21 = 0

Reorder the terms:
21 + 3u = 0

Solving
21 + 3u = 0

Solving for variable 'u'.

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

Add '-21' to each side of the equation.
21 + -21 + 3u = 0 + -21

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

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

Divide each side by '3'.
u = -7

Simplifying
u = -7

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