31=2u-9

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Solution for 31=2u-9 equation:


31=2u-9

We simplify the equation to the form, which is simple to understand 
31=2u-9

We move all terms containing u to the left and all other terms to the right. 
-2u=-9-31

We simplify left and right side of the equation. 
-2u=-40

We divide both sides of the equation by -02 to get u. 
u=20

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