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t in (-oo:+oo)
-57 = 2*t+5*t-8 // - 2*t+5*t-8
8-(2*t)-(5*t)-57 = 0
8-2*t-5*t-57 = 0
-7*t-49 = 0 // + 49
-7*t = 49 // : -7
t = 49/(-7)
t = -7
t = -7
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