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t in (-oo:+oo)
3-7*t = 17-5*t // - 17-5*t
3-7*t-(-5*t)-17 = 0
5*t-7*t-17+3 = 0
-2*t-14 = 0 // + 14
-2*t = 14 // : -2
t = 14/(-2)
t = -7
t = -7
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