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t in (-oo:+oo)
-97 = 3*t+5*t-9 // - 3*t+5*t-9
9-(3*t)-(5*t)-97 = 0
9-3*t-5*t-97 = 0
-8*t-88 = 0 // + 88
-8*t = 88 // : -8
t = 88/(-8)
t = -11
t = -11
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