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t in (-oo:+oo)
7*(-7*t-7) = 539 // - 539
7*(-7*t-7)-539 = 0
7*(-7*t-7)-539 = 0
-49*t-588 = 0
-49*t-588 = 0
-49*t-588 = 0 // + 588
-49*t = 588 // : -49
t = 588/(-49)
t = -12
t = -12
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