-2u-5=-21

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Solution for -2u-5=-21 equation: 


Simplifying
-2u + -5 = -21

Reorder the terms:
-5 + -2u = -21

Solving
-5 + -2u = -21

Solving for variable 'u'.

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

Add '5' to each side of the equation.
-5 + 5 + -2u = -21 + 5

Combine like terms: -5 + 5 = 0
0 + -2u = -21 + 5
-2u = -21 + 5

Combine like terms: -21 + 5 = -16
-2u = -16

Divide each side by '-2'.
u = 8

Simplifying
u = 8

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