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t in (-oo:+oo)
(3/5)*t+t+6 = 126/5 // - 126/5
(3/5)*t+t-(126/5)+6 = 0
(3/5)*t+t-126/5+6 = 0
8/5*t-96/5 = 0 // + 96/5
8/5*t = 96/5 // : 8/5
t = 96/5/8/5
t = 12
t = 12
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