3u-12=-21

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Solution for 3u-12=-21 equation: 


Simplifying
3u + -12 = -21

Reorder the terms:
-12 + 3u = -21

Solving
-12 + 3u = -21

Solving for variable 'u'.

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

Add '12' to each side of the equation.
-12 + 12 + 3u = -21 + 12

Combine like terms: -12 + 12 = 0
0 + 3u = -21 + 12
3u = -21 + 12

Combine like terms: -21 + 12 = -9
3u = -9

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

Simplifying
u = -3

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