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9t-13=20+12t
We move all terms to the left:
9t-13-(20+12t)=0
We add all the numbers together, and all the variables
9t-(12t+20)-13=0
We get rid of parentheses
9t-12t-20-13=0
We add all the numbers together, and all the variables
-3t-33=0
We move all terms containing t to the left, all other terms to the right
-3t=33
t=33/-3
t=-11
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