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-19=9t+8
We move all terms to the left:
-19-(9t+8)=0
We get rid of parentheses
-9t-8-19=0
We add all the numbers together, and all the variables
-9t-27=0
We move all terms containing t to the left, all other terms to the right
-9t=27
t=27/-9
t=-3
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