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80-3t=5t+8
We move all terms to the left:
80-3t-(5t+8)=0
We get rid of parentheses
-3t-5t-8+80=0
We add all the numbers together, and all the variables
-8t+72=0
We move all terms containing t to the left, all other terms to the right
-8t=-72
t=-72/-8
t=+9
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