U-(-3)=-21

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Solution for U-(-3)=-21 equation: 


Simplifying
U + -1(-3) = -21

Multiply -1 * -3
U + 3 = -21

Reorder the terms:
3 + U = -21

Solving
3 + U = -21

Solving for variable 'U'.

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

Add '-3' to each side of the equation.
3 + -3 + U = -21 + -3

Combine like terms: 3 + -3 = 0
0 + U = -21 + -3
U = -21 + -3

Combine like terms: -21 + -3 = -24
U = -24

Simplifying
U = -24

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