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t in (-oo:+oo)
-53 = 6*t+7*t-1 // - 6*t+7*t-1
1-(6*t)-(7*t)-53 = 0
1-6*t-7*t-53 = 0
-13*t-52 = 0 // + 52
-13*t = 52 // : -13
t = 52/(-13)
t = -4
t = -4
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