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x in (-oo:+oo)
F = (1/2)*r+3.25 // - (1/2)*r+3.25
F-((1/2)*r)-3.25 = 0
F+(-1/2)*r-3.25 = 0
F-1/2*r-3.25 = 0
x naleu017Cy do R
x in (-oo:+oo)
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