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12t-9=8+12t-17
We move all terms to the left:
12t-9-(8+12t-17)=0
We add all the numbers together, and all the variables
12t-(12t-9)-9=0
We get rid of parentheses
12t-12t+9-9=0
We add all the numbers together, and all the variables
=0
t=0/1
t=0
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