71=u+40

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Solution for 71=u+40 equation: 



71=u+40

We move all terms to the left:

71-(u+40)=0

We get rid of parentheses

-u-40+71=0

We add all the numbers together, and all the variables

-1u+31=0

We move all terms containing u to the left, all other terms to the right

-u=-31

u=-31/-1

u=+31

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