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31=-8t-98
We move all terms to the left:
31-(-8t-98)=0
We get rid of parentheses
8t+98+31=0
We add all the numbers together, and all the variables
8t+129=0
We move all terms containing t to the left, all other terms to the right
8t=-129
t=-129/8
t=-16+1/8
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