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t in (-oo:+oo)
10-(5*t) = 15 // - 15
10-(5*t)-15 = 0
10-5*t-15 = 0
-5*t-5 = 0 // + 5
-5*t = 5 // : -5
t = 5/(-5)
t = -1
t = -1
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