8u-3u-4u=9

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Solution for 8u-3u-4u=9 equation: 


Simplifying
8u + -3u + -4u = 9

Combine like terms: 8u + -3u = 5u
5u + -4u = 9

Combine like terms: 5u + -4u = 1u
1u = 9

Solving
1u = 9

Solving for variable 'u'.

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

Divide each side by '1'.
u = 9

Simplifying
u = 9

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