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t in (-oo:+oo)
-2*t-(6*t)-10 = -18 // + 18
18-2*t-(6*t)-10 = 0
18-2*t-6*t-10 = 0
8-8*t = 0 // - 8
-8*t = -8 // : -8
t = -8/(-8)
t = 1
t = 1
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