231=-7(-3t-9)

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Solution for 231=-7(-3t-9) equation: 



231=-7(-3t-9)

We move all terms to the left:

231-(-7(-3t-9))=0



We calculate terms in parentheses: -(-7(-3t-9)), so:

-7(-3t-9)

We multiply parentheses

21t+63

Back to the equation:

-(21t+63)



We get rid of parentheses

-21t-63+231=0

We add all the numbers together, and all the variables

-21t+168=0

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

-21t=-168

t=-168/-21

t=+8

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