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-15=9t-13
We move all terms to the left:
-15-(9t-13)=0
We get rid of parentheses
-9t+13-15=0
We add all the numbers together, and all the variables
-9t-2=0
We move all terms containing t to the left, all other terms to the right
-9t=2
t=2/-9
t=-2/9
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