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-0.85t-0.85t-3.9=-8.51
We move all terms to the left:
-0.85t-0.85t-3.9-(-8.51)=0
We add all the numbers together, and all the variables
-1.7t+4.61=0
We move all terms containing t to the left, all other terms to the right
-1.7t=-4.61
t=-4.61/-1.7
t=2+1/1.4049586776859
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