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400-8.75(11)=30t
We move all terms to the left:
400-8.75(11)-(30t)=0
We add all the numbers together, and all the variables
-30t+391.2489=0
We move all terms containing t to the left, all other terms to the right
-30t=-391.2489
t=-391.2489/-30
t=13+1/24.02113860197
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