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r in (-oo:+oo)
5*r+20/10 = 4*r-(16/4) // - 4*r-(16/4)
5*r-(4*r)+20/10+16/4 = 0
5*r-4*r+20/10+16/4 = 0
r+6 = 0 // - 6
r = -6
r = -6
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