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t in (-oo:+oo)
-6 = 5*t-3*t+6 // - 5*t-3*t+6
-(-3*t)-(5*t)-6-6 = 0
3*t-5*t-6-6 = 0
-2*t-12 = 0 // + 12
-2*t = 12 // : -2
t = 12/(-2)
t = -6
t = -6
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