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t in (-oo:+oo)
5*(-5*t-7) = 140 // - 140
5*(-5*t-7)-140 = 0
5*(-5*t-7)-140 = 0
-25*t-175 = 0
-25*t-175 = 0
-25*t-175 = 0 // + 175
-25*t = 175 // : -25
t = 175/(-25)
t = -7
t = -7
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