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t in (-oo:+oo)
t-7 = 4*t-13 // - 4*t-13
t-(4*t)-7+13 = 0
t-4*t-7+13 = 0
6-3*t = 0 // - 6
-3*t = -6 // : -3
t = -6/(-3)
t = 2
t = 2
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