-3u-21=0

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Solution for -3u-21=0 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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