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t in (-oo:+oo)
13-((3/5)*t) = 6 // - 6
13-((3/5)*t)-6 = 0
(-3/5)*t-6+13 = 0
7-3/5*t = 0 // - 7
-3/5*t = -7 // : -3/5
t = -7/(-3/5)
t = 35/3
t = 35/3
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