4u+5u=81

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Solution for 4u+5u=81 equation: 


Simplifying
4u + 5u = 81

Combine like terms: 4u + 5u = 9u
9u = 81

Solving
9u = 81

Solving for variable 'u'.

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

Divide each side by '9'.
u = 9

Simplifying
u = 9

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