-7u+9u=15-9

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Solution for -7u+9u=15-9 equation: 


Simplifying
-7u + 9u = 15 + -9

Combine like terms: -7u + 9u = 2u
2u = 15 + -9

Combine like terms: 15 + -9 = 6
2u = 6

Solving
2u = 6

Solving for variable 'u'.

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

Divide each side by '2'.
u = 3

Simplifying
u = 3

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