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4t-12(t=3)
We move all terms to the left:
4t-12(t-(3))=0
We multiply parentheses
4t-12t+36=0
We add all the numbers together, and all the variables
-8t+36=0
We move all terms containing t to the left, all other terms to the right
-8t=-36
t=-36/-8
t=4+1/2
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