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t in (-oo:+oo)
5*(-7*t-6) = -170 // + 170
5*(-7*t-6)+170 = 0
5*(-7*t-6)+170 = 0
140-35*t = 0
140-35*t = 0
140-35*t = 0 // - 140
-35*t = -140 // : -35
t = -140/(-35)
t = 4
t = 4
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