u-40+u-40=u-9

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Solution for u-40+u-40=u-9 equation: 



u-40+u-40=u-9

We move all terms to the left:

u-40+u-40-(u-9)=0

We add all the numbers together, and all the variables

2u-(u-9)-80=0

We get rid of parentheses

2u-u+9-80=0

We add all the numbers together, and all the variables

u-71=0

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

u=71

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