U+(-21)=18

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Solution for U+(-21)=18 equation: 


Simplifying
U + (-21) = 18
U + -21 = 18

Reorder the terms:
-21 + U = 18

Solving
-21 + U = 18

Solving for variable 'U'.

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

Add '21' to each side of the equation.
-21 + 21 + U = 18 + 21

Combine like terms: -21 + 21 = 0
0 + U = 18 + 21
U = 18 + 21

Combine like terms: 18 + 21 = 39
U = 39

Simplifying
U = 39

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