30=9+7t

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Solution for 30=9+7t equation: 



30=9+7t

We move all terms to the left:

30-(9+7t)=0

We add all the numbers together, and all the variables

-(7t+9)+30=0

We get rid of parentheses

-7t-9+30=0

We add all the numbers together, and all the variables

-7t+21=0

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

-7t=-21

t=-21/-7

t=+3

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