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8.57t+11t=400
We move all terms to the left:
8.57t+11t-(400)=0
We add all the numbers together, and all the variables
19.57t-400=0
We move all terms containing t to the left, all other terms to the right
19.57t=400
t=400/19.57
t=20+5.3749999999999/12.23125
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