-31=3u+9-80

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Solution for -31=3u+9-80 equation:


Simplifying
-31 = 3u + 9 + -80

Reorder the terms:
-31 = 9 + -80 + 3u

Combine like terms: 9 + -80 = -71
-31 = -71 + 3u

Solving
-31 = -71 + 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
-31 + -3u = -71 + 3u + -3u

Combine like terms: 3u + -3u = 0
-31 + -3u = -71 + 0
-31 + -3u = -71

Add '31' to each side of the equation.
-31 + 31 + -3u = -71 + 31

Combine like terms: -31 + 31 = 0
0 + -3u = -71 + 31
-3u = -71 + 31

Combine like terms: -71 + 31 = -40
-3u = -40

Divide each side by '-3'.
u = 13.33333333

Simplifying
u = 13.33333333

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