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