21=u+16

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Solution for 21=u+16 equation:


Simplifying
21 = u + 16

Reorder the terms:
21 = 16 + u

Solving
21 = 16 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
21 + -1u = 16 + u + -1u

Combine like terms: u + -1u = 0
21 + -1u = 16 + 0
21 + -1u = 16

Add '-21' to each side of the equation.
21 + -21 + -1u = 16 + -21

Combine like terms: 21 + -21 = 0
0 + -1u = 16 + -21
-1u = 16 + -21

Combine like terms: 16 + -21 = -5
-1u = -5

Divide each side by '-1'.
u = 5

Simplifying
u = 5

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