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18=3t+9
We move all terms to the left:
18-(3t+9)=0
We get rid of parentheses
-3t-9+18=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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