13-u=8

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Solution for 13-u=8 equation:


Simplifying
13 + -1u = 8

Solving
13 + -1u = 8

Solving for variable 'u'.

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

Add '-13' to each side of the equation.
13 + -13 + -1u = 8 + -13

Combine like terms: 13 + -13 = 0
0 + -1u = 8 + -13
-1u = 8 + -13

Combine like terms: 8 + -13 = -5
-1u = -5

Divide each side by '-1'.
u = 5

Simplifying
u = 5

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