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x in (-oo:+oo)
X/2+5*r = 5/6 // - 5/6
X/2+5*r-(5/6) = 0
X/2+5*r-5/6 = 0
1/2*X+5*r-5/6 = 0
x naleu017Cy do R
x in (-oo:+oo)
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