55=-9(u-12)-17

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Solution for 55=-9(u-12)-17 equation: 



55=-9(u-12)-17

We move all terms to the left:

55-(-9(u-12)-17)=0



We calculate terms in parentheses: -(-9(u-12)-17), so:

-9(u-12)-17

We multiply parentheses

-9u+108-17

We add all the numbers together, and all the variables

-9u+91

Back to the equation:

-(-9u+91)



We get rid of parentheses

9u-91+55=0

We add all the numbers together, and all the variables

9u-36=0

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

9u=36

u=36/9

u=4

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