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t in (-oo:+oo)
18/5 = t/4 // - t/4
18/5-(t/4) = 0
18/5-1/4*t = 0 // - 18/5
-1/4*t = -18/5 // : -1/4
t = -18/5/(-1/4)
t = 72/5
t = 72/5
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