(9,-4)=(10,u)

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Solution for (9,-4)=(10,u) equation: 



(9.-4)=(10.u)

We move all terms to the left:

(9.-4)-((10.u))=0

We add all the numbers together, and all the variables

-((+10.u))+5=0



We calculate terms in parentheses: -((+10.u)), so:

(+10.u)

We get rid of parentheses

10.u

Back to the equation:

-(10.u)



We add all the numbers together, and all the variables

-(+10.u)+5=0

We get rid of parentheses

-10.u+5=0

We add all the numbers together, and all the variables

-10u+5=0

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

-10u=-5

u=-5/-10

u=1/2

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