U-0=21

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Solution for U-0=21 equation: 


Simplifying
U + 0 = 21

Reorder the terms:
0 + U = 21
Remove the zero:
U = 21

Solving
U = 21

Solving for variable 'U'.

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

Simplifying
U = 21

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