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-3t-9=4-12t
We move all terms to the left:
-3t-9-(4-12t)=0
We add all the numbers together, and all the variables
-3t-(-12t+4)-9=0
We get rid of parentheses
-3t+12t-4-9=0
We add all the numbers together, and all the variables
9t-13=0
We move all terms containing t to the left, all other terms to the right
9t=13
t=13/9
t=1+4/9
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