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8t=9t-4
We move all terms to the left:
8t-(9t-4)=0
We get rid of parentheses
8t-9t+4=0
We add all the numbers together, and all the variables
-1t+4=0
We move all terms containing t to the left, all other terms to the right
-t=-4
t=-4/-1
t=+4
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