15=3u-9

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Solution for 15=3u-9 equation:


Simplifying
15 = 3u + -9

Reorder the terms:
15 = -9 + 3u

Solving
15 = -9 + 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
15 + -3u = -9 + 3u + -3u

Combine like terms: 3u + -3u = 0
15 + -3u = -9 + 0
15 + -3u = -9

Add '-15' to each side of the equation.
15 + -15 + -3u = -9 + -15

Combine like terms: 15 + -15 = 0
0 + -3u = -9 + -15
-3u = -9 + -15

Combine like terms: -9 + -15 = -24
-3u = -24

Divide each side by '-3'.
u = 8

Simplifying
u = 8

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