-55=8-7u

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Solution for -55=8-7u equation: 



-55=8-7u

We move all terms to the left:

-55-(8-7u)=0

We add all the numbers together, and all the variables

-(-7u+8)-55=0

We get rid of parentheses

7u-8-55=0

We add all the numbers together, and all the variables

7u-63=0

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

7u=63

u=63/7

u=9

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