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12t-4(t+3)=15
We move all terms to the left:
12t-4(t+3)-(15)=0
We multiply parentheses
12t-4t-12-15=0
We add all the numbers together, and all the variables
8t-27=0
We move all terms containing t to the left, all other terms to the right
8t=27
t=27/8
t=3+3/8
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