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2016-02-12T11:35:00+08:00
24t - 5t² = 28
-5t² + 24t - 28 = 0
5t² - 24t + 28 = 0
(5t - 14) (t - 2) = 0
5t - 14 = 0
         t = 14/5
atau
t - 2 = 0
     t = 2
1 5 1