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t in (-oo:+oo)
(2/5)*t+3 = (6/5)*t-13 // - (6/5)*t-13
(2/5)*t-((6/5)*t)+3+13 = 0
(2/5)*t+(-6/5)*t+3+13 = 0
16-4/5*t = 0 // - 16
-4/5*t = -16 // : -4/5
t = -16/(-4/5)
t = 20
t = 20
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