3u-3=-21

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Solution for 3u-3=-21 equation: 


Simplifying
3u + -3 = -21

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

Solving
-3 + 3u = -21

Solving for variable 'u'.

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

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

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

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

Divide each side by '3'.
u = -6

Simplifying
u = -6

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