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t in (-oo:+oo)
13 = (7/3)*t+8 // - (7/3)*t+8
13-((7/3)*t)-8 = 0
(-7/3)*t-8+13 = 0
5-7/3*t = 0 // - 5
-7/3*t = -5 // : -7/3
t = -5/(-7/3)
t = 15/7
t = 15/7
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