21=-3(t+25)

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Solution for 21=-3(t+25) equation: 



21=-3(t+25)

We move all terms to the left:

21-(-3(t+25))=0



We calculate terms in parentheses: -(-3(t+25)), so:

-3(t+25)

We multiply parentheses

-3t-75

Back to the equation:

-(-3t-75)



We get rid of parentheses

3t+75+21=0

We add all the numbers together, and all the variables

3t+96=0

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

3t=-96

t=-96/3

t=-32

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