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-0.85t-0.58t-3.9=-8.15
We move all terms to the left:
-0.85t-0.58t-3.9-(-8.15)=0
We add all the numbers together, and all the variables
-1.43t+4.25=0
We move all terms containing t to the left, all other terms to the right
-1.43t=-4.25
t=-4.25/-1.43
t=2+1/1.0287769784173
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