9u=-1

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Solution for 9u=-1 equation:


9u=-1

We simplify the equation to the form, which is simple to understand 
9u=-1

We move all terms containing u to the left and all other terms to the right. 
+9u=-1

We simplify left and right side of the equation. 
+9u=-1

We divide both sides of the equation by 9 to get u. 
u=-0.111111111111

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