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t in (-oo:+oo)
5*(6-7*t) = -40 // + 40
5*(6-7*t)+40 = 0
5*(6-7*t)+40 = 0
70-35*t = 0
70-35*t = 0
70-35*t = 0 // - 70
-35*t = -70 // : -35
t = -70/(-35)
t = 2
t = 2
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