18=-3(7-3t)

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Solution for 18=-3(7-3t) equation: 



18=-3(7-3t)

We move all terms to the left:

18-(-3(7-3t))=0

We add all the numbers together, and all the variables

-(-3(-3t+7))+18=0



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

-3(-3t+7)

We multiply parentheses

9t-21

Back to the equation:

-(9t-21)



We get rid of parentheses

-9t+21+18=0

We add all the numbers together, and all the variables

-9t+39=0

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

-9t=-39

t=-39/-9

t=4+1/3

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