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t in (-oo:+oo)
4*(-5*t-9) = 64 // - 64
4*(-5*t-9)-64 = 0
4*(-5*t-9)-64 = 0
-20*t-100 = 0
-20*t-100 = 0
-20*t-100 = 0 // + 100
-20*t = 100 // : -20
t = 100/(-20)
t = -5
t = -5
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