21-3u=4u

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Solution for 21-3u=4u equation:


Simplifying
21 + -3u = 4u

Solving
21 + -3u = 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
21 + -3u + -4u = 4u + -4u

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

Combine like terms: 4u + -4u = 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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