u=15-4u

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Solution for u=15-4u equation: 


Simplifying
u = 15 + -4u

Solving
u = 15 + -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
u + 4u = 15 + -4u + 4u

Combine like terms: u + 4u = 5u
5u = 15 + -4u + 4u

Combine like terms: -4u + 4u = 0
5u = 15 + 0
5u = 15

Divide each side by '5'.
u = 3

Simplifying
u = 3

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