u-(-6)=21

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Solution for u-(-6)=21 equation: 


Simplifying
u + -1(-6) = 21

Multiply -1 * -6
u + 6 = 21

Reorder the terms:
6 + u = 21

Solving
6 + u = 21

Solving for variable 'u'.

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

Add '-6' to each side of the equation.
6 + -6 + u = 21 + -6

Combine like terms: 6 + -6 = 0
0 + u = 21 + -6
u = 21 + -6

Combine like terms: 21 + -6 = 15
u = 15

Simplifying
u = 15

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