30=18-9+u+15

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Solution for 30=18-9+u+15 equation:


Simplifying
30 = 18 + -9 + u + 15

Reorder the terms:
30 = 18 + -9 + 15 + u

Combine like terms: 18 + -9 = 9
30 = 9 + 15 + u

Combine like terms: 9 + 15 = 24
30 = 24 + u

Solving
30 = 24 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
30 + -1u = 24 + u + -1u

Combine like terms: u + -1u = 0
30 + -1u = 24 + 0
30 + -1u = 24

Add '-30' to each side of the equation.
30 + -30 + -1u = 24 + -30

Combine like terms: 30 + -30 = 0
0 + -1u = 24 + -30
-1u = 24 + -30

Combine like terms: 24 + -30 = -6
-1u = -6

Divide each side by '-1'.
u = 6

Simplifying
u = 6

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