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t in (-oo:+oo)
-6 = 5*t-3*t+2 // - 5*t-3*t+2
-(-3*t)-(5*t)-6-2 = 0
3*t-5*t-6-2 = 0
-2*t-8 = 0 // + 8
-2*t = 8 // : -2
t = 8/(-2)
t = -4
t = -4
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