3u-40=u

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Solution for 3u-40=u equation:


Simplifying
3u + -40 = u

Reorder the terms:
-40 + 3u = u

Solving
-40 + 3u = u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
-40 + 3u + -1u = u + -1u

Combine like terms: 3u + -1u = 2u
-40 + 2u = u + -1u

Combine like terms: u + -1u = 0
-40 + 2u = 0

Add '40' to each side of the equation.
-40 + 40 + 2u = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 2u = 0 + 40
2u = 0 + 40

Combine like terms: 0 + 40 = 40
2u = 40

Divide each side by '2'.
u = 20

Simplifying
u = 20

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