-t=9(t-20)

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Solution for -t=9(t-20) equation: 



-t=9(t-20)

We move all terms to the left:

-t-(9(t-20))=0

We add all the numbers together, and all the variables

-1t-(9(t-20))=0



We calculate terms in parentheses: -(9(t-20)), so:

9(t-20)

We multiply parentheses

9t-180

Back to the equation:

-(9t-180)



We get rid of parentheses

-1t-9t+180=0

We add all the numbers together, and all the variables

-10t+180=0

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

-10t=-180

t=-180/-10

t=+18

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