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t in (-oo:+oo)
(1/7)*(4*t-7) = (9/7)*t-((t+7)/14) // - (9/7)*t-((t+7)/14)
(1/7)*(4*t-7)+(t+7)/14-((9/7)*t) = 0
(1/7)*(4*t-7)+(t+7)/14+(-9/7)*t = 0
1/7*(4*t-7)+(t+7)/14+(-9*t)/7 = 0
(1/7*7*14*(4*t-7))/(7*14)+(7*(t+7))/(7*14)+(-9*14*t)/(7*14) = 0
1/7*7*14*(4*t-7)+7*(t+7)-9*14*t = 0
63*t-126*t-49 = 0
-63*t-49 = 0
(-63*t-49)/(7*14) = 0
(-63*t-49)/(7*14) = 0 // * 7*14
-63*t-49 = 0
-63*t-49 = 0 // + 49
-63*t = 49 // : -63
t = 49/(-63)
t = -7/9
t = -7/9
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