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x in (-oo:+oo)
(1/2)*r+2*(3/4-1) = (1/4)*R // - (1/4)*R
(1/2)*r-((1/4)*R)+2*(3/4-1) = 0
(-1/4)*R+(1/2)*r+2*(3/4-1) = 0
1/2*r-1/4*R-1/2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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