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88.4=10t+8.4
We move all terms to the left:
88.4-(10t+8.4)=0
We get rid of parentheses
-10t-8.4+88.4=0
We add all the numbers together, and all the variables
-10t+80=0
We move all terms containing t to the left, all other terms to the right
-10t=-80
t=-80/-10
t=+8
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