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18-(-15)=-3t
We move all terms to the left:
18-(-15)-(-3t)=0
We add all the numbers together, and all the variables
-(-3t)+33=0
We get rid of parentheses
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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