7u-91=5u-55

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Solution for 7u-91=5u-55 equation: 



7u-91=5u-55

We move all terms to the left:

7u-91-(5u-55)=0

We get rid of parentheses

7u-5u+55-91=0

We add all the numbers together, and all the variables

2u-36=0

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

2u=36

u=36/2

u=18

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