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t in (-oo:+oo)
7*(-(5*t)-2) = 301 // - 301
7*(-(5*t)-2)-301 = 0
7*(-5*t-2)-301 = 0
7*(-5*t-2)-301 = 0
-35*t-315 = 0
-35*t-315 = 0
-35*t-315 = 0 // + 315
-35*t = 315 // : -35
t = 315/(-35)
t = -9
t = -9
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