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t in (-oo:+oo)
5*(-4*t-6) = -150 // + 150
5*(-4*t-6)+150 = 0
5*(-4*t-6)+150 = 0
120-20*t = 0
120-20*t = 0
120-20*t = 0 // - 120
-20*t = -120 // : -20
t = -120/(-20)
t = 6
t = 6
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