Answer:
5/6 = t
Explanation:
8-9t=21t-17
Add 9t to each side
8-9t+9t=21t+9t-17
8 = 30t - 17
Add 17 to each side
8+17 = 30t-17+17
25 = 30t
Divide each side by 30
25/30 = 30t/30
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