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15t=12t+9
We move all terms to the left:
15t-(12t+9)=0
We get rid of parentheses
15t-12t-9=0
We add all the numbers together, and all the variables
3t-9=0
We move all terms containing t to the left, all other terms to the right
3t=9
t=9/3
t=3
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