84=-4u

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Solution for 84=-4u equation:


Simplifying
84 = -4u

Solving
84 = -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.
84 + 4u = -4u + 4u

Combine like terms: -4u + 4u = 0
84 + 4u = 0

Add '-84' to each side of the equation.
84 + -84 + 4u = 0 + -84

Combine like terms: 84 + -84 = 0
0 + 4u = 0 + -84
4u = 0 + -84

Combine like terms: 0 + -84 = -84
4u = -84

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

Simplifying
u = -21

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