21-4u=3u

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Solution for 21-4u=3u equation:


Simplifying
21 + -4u = 3u

Solving
21 + -4u = 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 + -4u + -3u = 3u + -3u

Combine like terms: -4u + -3u = -7u
21 + -7u = 3u + -3u

Combine like terms: 3u + -3u = 0
21 + -7u = 0

Add '-21' to each side of the equation.
21 + -21 + -7u = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -7u = 0 + -21
-7u = 0 + -21

Combine like terms: 0 + -21 = -21
-7u = -21

Divide each side by '-7'.
u = 3

Simplifying
u = 3

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