9+-21=3(t-7)

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Solution for 9+-21=3(t-7) equation: 



9+-21=3(t-7)

We move all terms to the left:

9+-21-(3(t-7))=0

We add all the numbers together, and all the variables

-(3(t-7))=0



We calculate terms in parentheses: -(3(t-7)), so:

3(t-7)

We multiply parentheses

3t-21

Back to the equation:

-(3t-21)



We get rid of parentheses

-3t+21=0

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

-3t=-21

t=-21/-3

t=+7

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