180=21-u

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Solution for 180=21-u equation:


Simplifying
180 = 21 + -1u

Solving
180 = 21 + -1u

Solving for variable 'u'.

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

Add 'u' to each side of the equation.
180 + u = 21 + -1u + u

Combine like terms: -1u + u = 0
180 + u = 21 + 0
180 + u = 21

Add '-180' to each side of the equation.
180 + -180 + u = 21 + -180

Combine like terms: 180 + -180 = 0
0 + u = 21 + -180
u = 21 + -180

Combine like terms: 21 + -180 = -159
u = -159

Simplifying
u = -159

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