231-u=90

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Solution for 231-u=90 equation: 


Simplifying
231 + -1u = 90

Solving
231 + -1u = 90

Solving for variable 'u'.

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

Add '-231' to each side of the equation.
231 + -231 + -1u = 90 + -231

Combine like terms: 231 + -231 = 0
0 + -1u = 90 + -231
-1u = 90 + -231

Combine like terms: 90 + -231 = -141
-1u = -141

Divide each side by '-1'.
u = 141

Simplifying
u = 141

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