U-7=9+12

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Solution for U-7=9+12 equation: 


Simplifying
U + -7 = 9 + 12

Reorder the terms:
-7 + U = 9 + 12

Combine like terms: 9 + 12 = 21
-7 + U = 21

Solving
-7 + U = 21

Solving for variable 'U'.

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

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

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

Combine like terms: 21 + 7 = 28
U = 28

Simplifying
U = 28

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