3(5+u)=

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Solution for 3(5+u)= equation: 


Simplifying
3(5 + u) = 0
(5 * 3 + u * 3) = 0
(15 + 3u) = 0

Solving
15 + 3u = 0

Solving for variable 'u'.

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

Add '-15' to each side of the equation.
15 + -15 + 3u = 0 + -15

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

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

Divide each side by '3'.
u = -5

Simplifying
u = -5

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