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.8(t+2000)=3840
We move all terms to the left:
.8(t+2000)-(3840)=0
We multiply parentheses
0.8t+1600-3840=0
We add all the numbers together, and all the variables
0.8t-2240=0
We move all terms containing t to the left, all other terms to the right
0.8t=2240
t=2240/0.8
t=2800
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