3=u+3u

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Solution for 3=u+3u equation:


Simplifying
3 = u + 3u

Combine like terms: u + 3u = 4u
3 = 4u

Solving
3 = 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.
3 + -4u = 4u + -4u

Combine like terms: 4u + -4u = 0
3 + -4u = 0

Add '-3' to each side of the equation.
3 + -3 + -4u = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -4u = 0 + -3
-4u = 0 + -3

Combine like terms: 0 + -3 = -3
-4u = -3

Divide each side by '-4'.
u = 0.75

Simplifying
u = 0.75

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