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x in (-oo:+oo)
5*m = (4*r)/t-7 // - (4*r)/t-7
5*m-((4*r)/t)+7 = 0
5*m-4*r*t^-1+7 = 0
5*m-4*r*t^-1+7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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