u+21=2u

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Solution for u+21=2u equation:


Simplifying
u + 21 = 2u

Reorder the terms:
21 + u = 2u

Solving
21 + u = 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
21 + u + -2u = 2u + -2u

Combine like terms: u + -2u = -1u
21 + -1u = 2u + -2u

Combine like terms: 2u + -2u = 0
21 + -1u = 0

Add '-21' to each side of the equation.
21 + -21 + -1u = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -1u = 0 + -21
-1u = 0 + -21

Combine like terms: 0 + -21 = -21
-1u = -21

Divide each side by '-1'.
u = 21

Simplifying
u = 21

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