3-9u=12

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Solution for 3-9u=12 equation: 


Simplifying
3 + -9u = 12

Solving
3 + -9u = 12

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 + -9u = 12 + -3

Combine like terms: 3 + -3 = 0
0 + -9u = 12 + -3
-9u = 12 + -3

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

Divide each side by '-9'.
u = -1

Simplifying
u = -1

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