84=-21u

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Solution for 84=-21u equation:


Simplifying
84 = -21u

Solving
84 = -21u

Solving for variable 'u'.

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

Add '21u' to each side of the equation.
84 + 21u = -21u + 21u

Combine like terms: -21u + 21u = 0
84 + 21u = 0

Add '-84' to each side of the equation.
84 + -84 + 21u = 0 + -84

Combine like terms: 84 + -84 = 0
0 + 21u = 0 + -84
21u = 0 + -84

Combine like terms: 0 + -84 = -84
21u = -84

Divide each side by '21'.
u = -4

Simplifying
u = -4

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