90-u=57

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Solution for 90-u=57 equation:


Simplifying
90 + -1u = 57

Solving
90 + -1u = 57

Solving for variable 'u'.

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

Add '-90' to each side of the equation.
90 + -90 + -1u = 57 + -90

Combine like terms: 90 + -90 = 0
0 + -1u = 57 + -90
-1u = 57 + -90

Combine like terms: 57 + -90 = -33
-1u = -33

Divide each side by '-1'.
u = 33

Simplifying
u = 33

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