25-3u=20

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Solution for 25-3u=20 equation: 


Simplifying
25 + -3u = 20

Solving
25 + -3u = 20

Solving for variable 'u'.

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

Add '-25' to each side of the equation.
25 + -25 + -3u = 20 + -25

Combine like terms: 25 + -25 = 0
0 + -3u = 20 + -25
-3u = 20 + -25

Combine like terms: 20 + -25 = -5
-3u = -5

Divide each side by '-3'.
u = 1.666666667

Simplifying
u = 1.666666667

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