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t in (-oo:+oo)
7*(1-(7*t)) = -532 // + 532
7*(1-(7*t))+532 = 0
7*(1-7*t)+532 = 0
7*(1-7*t)+532 = 0
539-49*t = 0
539-49*t = 0
539-49*t = 0 // - 539
-49*t = -539 // : -49
t = -539/(-49)
t = 11
t = 11
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