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15=30t+9
We move all terms to the left:
15-(30t+9)=0
We get rid of parentheses
-30t-9+15=0
We add all the numbers together, and all the variables
-30t+6=0
We move all terms containing t to the left, all other terms to the right
-30t=-6
t=-6/-30
t=1/5
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