15=6-3u

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Solution for 15=6-3u equation:


Simplifying
15 = 6 + -3u

Solving
15 = 6 + -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 = 6 + -3u + 3u

Combine like terms: -3u + 3u = 0
15 + 3u = 6 + 0
15 + 3u = 6

Add '-15' to each side of the equation.
15 + -15 + 3u = 6 + -15

Combine like terms: 15 + -15 = 0
0 + 3u = 6 + -15
3u = 6 + -15

Combine like terms: 6 + -15 = -9
3u = -9

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

Simplifying
u = -3

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