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t in (-oo:+oo)
7*(4-5*t) = -77 // + 77
7*(4-5*t)+77 = 0
7*(4-5*t)+77 = 0
105-35*t = 0
105-35*t = 0
105-35*t = 0 // - 105
-35*t = -105 // : -35
t = -105/(-35)
t = 3
t = 3
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