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t in (-oo:+oo)
196/5 = 6*t-((3/7)*t)+1/5 // - 6*t-((3/7)*t)+1/5
(3/7)*t-(6*t)+196/5-(1/5) = 0
(3/7)*t-6*t+196/5-1/5 = 0
39-39/7*t = 0 // - 39
-39/7*t = -39 // : -39/7
t = -39/(-39/7)
t = 7
t = 7
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