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t in (-oo:+oo)
-8 = t/4-5 // - t/4-5
5-(t/4)-8 = 0
-1/4*t-3 = 0 // + 3
-1/4*t = 3 // : -1/4
t = 3/(-1/4)
t = -12
t = -12
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