7u-40=-9(u-8)

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Solution for 7u-40=-9(u-8) equation: 



7u-40=-9(u-8)

We move all terms to the left:

7u-40-(-9(u-8))=0



We calculate terms in parentheses: -(-9(u-8)), so:

-9(u-8)

We multiply parentheses

-9u+72

Back to the equation:

-(-9u+72)



We get rid of parentheses

7u+9u-72-40=0

We add all the numbers together, and all the variables

16u-112=0

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

16u=112

u=112/16

u=7

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