31=3u+(u-2)

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Solution for 31=3u+(u-2) equation: 


Simplifying
31 = 3u + (u + -2)

Reorder the terms:
31 = 3u + (-2 + u)

Remove parenthesis around (-2 + u)
31 = 3u + -2 + u

Reorder the terms:
31 = -2 + 3u + u

Combine like terms: 3u + u = 4u
31 = -2 + 4u

Solving
31 = -2 + 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.
31 + -4u = -2 + 4u + -4u

Combine like terms: 4u + -4u = 0
31 + -4u = -2 + 0
31 + -4u = -2

Add '-31' to each side of the equation.
31 + -31 + -4u = -2 + -31

Combine like terms: 31 + -31 = 0
0 + -4u = -2 + -31
-4u = -2 + -31

Combine like terms: -2 + -31 = -33
-4u = -33

Divide each side by '-4'.
u = 8.25

Simplifying
u = 8.25

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