12u-9u=21

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Solution for 12u-9u=21 equation: 


Simplifying
12u + -9u = 21

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

Solving
3u = 21

Solving for variable 'u'.

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

Divide each side by '3'.
u = 7

Simplifying
u = 7

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