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(3t+6)+9=30
We move all terms to the left:
(3t+6)+9-(30)=0
We add all the numbers together, and all the variables
(3t+6)-21=0
We get rid of parentheses
3t+6-21=0
We add all the numbers together, and all the variables
3t-15=0
We move all terms containing t to the left, all other terms to the right
3t=15
t=15/3
t=5
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