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t in (-oo:+oo)
(1/7)*(7*t-4) = (t+4)/14 // - (t+4)/14
(1/7)*(7*t-4)-((t+4)/14) = 0
1/7*(7*t-4)+(-1*(t+4))/14 = 0
(1/7*14*(7*t-4))/14+(-1*(t+4))/14 = 0
1/7*14*(7*t-4)-1*(t+4) = 0
13*t-12 = 0
(13*t-12)/14 = 0
(13*t-12)/14 = 0 // * 14
13*t-12 = 0
13*t-12 = 0 // + 12
13*t = 12 // : 13
t = 12/13
t = 12/13
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