3u+9-8u=31

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Solution for 3u+9-8u=31 equation:


Simplifying
3u + 9 + -8u = 31

Reorder the terms:
9 + 3u + -8u = 31

Combine like terms: 3u + -8u = -5u
9 + -5u = 31

Solving
9 + -5u = 31

Solving for variable 'u'.

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

Add '-9' to each side of the equation.
9 + -9 + -5u = 31 + -9

Combine like terms: 9 + -9 = 0
0 + -5u = 31 + -9
-5u = 31 + -9

Combine like terms: 31 + -9 = 22
-5u = 22

Divide each side by '-5'.
u = -4.4

Simplifying
u = -4.4

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