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t in (-oo:+oo)
5-(4*t) = 13 // - 13
5-(4*t)-13 = 0
5-4*t-13 = 0
-4*t-8 = 0 // + 8
-4*t = 8 // : -4
t = 8/(-4)
t = -2
t = -2
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