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t in (-oo:+oo)
-(7*t)-1 = -57 // + 57
57-(7*t)-1 = 0
57-7*t-1 = 0
56-7*t = 0 // - 56
-7*t = -56 // : -7
t = -56/(-7)
t = 8
t = 8
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