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t in (-oo:+oo)
t/4 = 9-13-11 // - 9-13-11
t/4-9+11+13 = 0
1/4*t+15 = 0 // - 15
1/4*t = -15 // : 1/4
t = -15/1/4
t = -60
t = -60
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