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t in (-oo:+oo)
15/4 = t/45 // - t/45
15/4-(t/45) = 0
15/4-1/45*t = 0 // - 15/4
-1/45*t = -15/4 // : -1/45
t = -15/4/(-1/45)
t = 675/4
t = 675/4
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