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t in (-oo:+oo)
-5*t-8 = 5*t-18 // - 5*t-18
18-5*t-(5*t)-8 = 0
18-5*t-5*t-8 = 0
10-10*t = 0 // - 10
-10*t = -10 // : -10
t = -10/(-10)
t = 1
t = 1
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