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t in (-oo:+oo)
(1/7)*(7*t-9) = (9/7)*t-t+9/14 // - (9/7)*t-t+9/14
(1/7)*(7*t-9)-((9/7)*t)+t-(9/14) = 0
(1/7)*(7*t-9)+(-9/7)*t+t-9/14 = 0
1/7*(7*t-9)+(-9*t)/7+t-9/14 = 0
(1/7*7*14*(7*t-9))/(7*14)+(-9*14*t)/(7*14)+(7*14*t)/(7*14)+(-9*7)/(7*14) = 0
1/7*7*14*(7*t-9)-9*14*t+7*14*t-9*7 = 0
98*t-28*t-126-63 = 0
70*t-126-63 = 0
70*t-189 = 0
(70*t-189)/(7*14) = 0
(70*t-189)/(7*14) = 0 // * 7*14
70*t-189 = 0
70*t-189 = 0 // + 189
70*t = 189 // : 70
t = 189/70
t = 27/10
t = 27/10
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