31=4-9u

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Solution for 31=4-9u equation:


Simplifying
31 = 4 + -9u

Solving
31 = 4 + -9u

Solving for variable 'u'.

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

Add '9u' to each side of the equation.
31 + 9u = 4 + -9u + 9u

Combine like terms: -9u + 9u = 0
31 + 9u = 4 + 0
31 + 9u = 4

Add '-31' to each side of the equation.
31 + -31 + 9u = 4 + -31

Combine like terms: 31 + -31 = 0
0 + 9u = 4 + -31
9u = 4 + -31

Combine like terms: 4 + -31 = -27
9u = -27

Divide each side by '9'.
u = -3

Simplifying
u = -3

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