-21=-6+5u

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Solution for -21=-6+5u equation:


Simplifying
-21 = -6 + 5u

Solving
-21 = -6 + 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 = -6 + 5u + -5u

Combine like terms: 5u + -5u = 0
-21 + -5u = -6 + 0
-21 + -5u = -6

Add '21' to each side of the equation.
-21 + 21 + -5u = -6 + 21

Combine like terms: -21 + 21 = 0
0 + -5u = -6 + 21
-5u = -6 + 21

Combine like terms: -6 + 21 = 15
-5u = 15

Divide each side by '-5'.
u = -3

Simplifying
u = -3

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