13u-21=3u

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Solution for 13u-21=3u equation:


Simplifying
13u + -21 = 3u

Reorder the terms:
-21 + 13u = 3u

Solving
-21 + 13u = 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.
-21 + 13u + -3u = 3u + -3u

Combine like terms: 13u + -3u = 10u
-21 + 10u = 3u + -3u

Combine like terms: 3u + -3u = 0
-21 + 10u = 0

Add '21' to each side of the equation.
-21 + 21 + 10u = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 10u = 0 + 21
10u = 0 + 21

Combine like terms: 0 + 21 = 21
10u = 21

Divide each side by '10'.
u = 2.1

Simplifying
u = 2.1

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