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x in (-oo:+oo)
T+6/t = ((7*t)/5)*t // - ((7*t)/5)*t
T-(((7*t)/5)*t)+6/t = 0
T+(-7/5)*t^2+6/t = 0
T-7/5*t^2+6*t^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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