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t in (-oo:+oo)
(3/5)*(15*t-25)-(9*t) = 0
(3/5)*(15*t-25)-9*t = 0
3/5*(15*t-25)-9*t = 0
3/5*(15*t-25)-9*t = 0
-15 = 0
-15 = 0
t belongs to the empty set
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