-t=9(t-90)

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Solution for -t=9(t-90) equation: 



-t=9(t-90)

We move all terms to the left:

-t-(9(t-90))=0

We add all the numbers together, and all the variables

-1t-(9(t-90))=0



We calculate terms in parentheses: -(9(t-90)), so:

9(t-90)

We multiply parentheses

9t-810

Back to the equation:

-(9t-810)



We get rid of parentheses

-1t-9t+810=0

We add all the numbers together, and all the variables

-10t+810=0

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

-10t=-810

t=-810/-10

t=+81

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