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t in (-oo:+oo)
-6*t-(4*t)-1 = -71 // + 71
71-6*t-(4*t)-1 = 0
71-6*t-4*t-1 = 0
70-10*t = 0 // - 70
-10*t = -70 // : -10
t = -70/(-10)
t = 7
t = 7
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