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t in (-oo:+oo)
(7/6)*t+t-(4/7)-42 = 0
(7/6)*t+t-4/7-42 = 0
13/6*t-298/7 = 0 // + 298/7
13/6*t = 298/7 // : 13/6
t = 298/7/13/6
t = 1788/91
t = 1788/91
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