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t in (-oo:+oo)
(-9/8)*t = 3/10 // - 3/10
(-9/8)*t-(3/10) = 0
(-9/8)*t-3/10 = 0
-9/8*t-3/10 = 0 // + 3/10
-9/8*t = 3/10 // : -9/8
t = 3/10/(-9/8)
t = -4/15
t = -4/15
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