123-u=213

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Solution for 123-u=213 equation: 


Simplifying
123 + -1u = 213

Solving
123 + -1u = 213

Solving for variable 'u'.

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

Add '-123' to each side of the equation.
123 + -123 + -1u = 213 + -123

Combine like terms: 123 + -123 = 0
0 + -1u = 213 + -123
-1u = 213 + -123

Combine like terms: 213 + -123 = 90
-1u = 90

Divide each side by '-1'.
u = -90

Simplifying
u = -90

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