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0.85t+0.5=3.9
We move all terms to the left:
0.85t+0.5-(3.9)=0
We add all the numbers together, and all the variables
0.85t-3.4=0
We move all terms containing t to the left, all other terms to the right
0.85t=3.4
t=3.4/0.85
t=4
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