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t in (-oo:+oo)
-3*t-1 = 7*t+119 // - 7*t+119
-3*t-(7*t)-119-1 = 0
-3*t-7*t-119-1 = 0
-10*t-120 = 0 // + 120
-10*t = 120 // : -10
t = 120/(-10)
t = -12
t = -12
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