-21=-5u

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Solution for -21=-5u equation:


Simplifying
-21 = -5u

Solving
-21 = -5u

Solving for variable 'u'.

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

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

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

Add '21' to each side of the equation.
-21 + 21 + 5u = 0 + 21

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

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

Divide each side by '5'.
u = 4.2

Simplifying
u = 4.2

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