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t in (-oo:+oo)
13.2 = t/7 // - t/7
13.2-(t/7) = 0
13.2-1/7*t = 0 // - 13.2
-1/7*t = -13.2 // : -1/7
t = -13.2/(-1/7)
t = 92.40000185
t = 92.40000185
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