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t in (-oo:+oo)
-(6*t)-6 = 7*t+98 // - 7*t+98
-(6*t)-(7*t)-98-6 = 0
-6*t-7*t-98-6 = 0
-13*t-104 = 0 // + 104
-13*t = 104 // : -13
t = 104/(-13)
t = -8
t = -8
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