-21=-5+4u

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Solution for -21=-5+4u equation: 


Simplifying
-21 = -5 + 4u

Solving
-21 = -5 + 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
-21 + -4u = -5 + 4u + -4u

Combine like terms: 4u + -4u = 0
-21 + -4u = -5 + 0
-21 + -4u = -5

Add '21' to each side of the equation.
-21 + 21 + -4u = -5 + 21

Combine like terms: -21 + 21 = 0
0 + -4u = -5 + 21
-4u = -5 + 21

Combine like terms: -5 + 21 = 16
-4u = 16

Divide each side by '-4'.
u = -4

Simplifying
u = -4

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