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t in (-oo:+oo)
(5/7)*(t-3)-(39/7) = -6 // + 6
(5/7)*(t-3)-(39/7)+6 = 0
(5/7)*(t-3)-39/7+6 = 0
5/7*(t-3)-39/7+6 = 0
(5/7*7*(t-3))/7-39/7+(6*7)/7 = 0
5/7*7*(t-3)+6*7-39 = 0
5*t-54+42 = 0
5*t-12 = 0
(5*t-12)/7 = 0
(5*t-12)/7 = 0 // * 7
5*t-12 = 0
5*t-12 = 0 // + 12
5*t = 12 // : 5
t = 12/5
t = 12/5
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