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t in (-oo:+oo)
5*(-7*t-7) = -420 // + 420
5*(-7*t-7)+420 = 0
5*(-7*t-7)+420 = 0
385-35*t = 0
385-35*t = 0
385-35*t = 0 // - 385
-35*t = -385 // : -35
t = -385/(-35)
t = 11
t = 11
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