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r in (-oo:+oo)
4*r+24/12 = 2*r-(16/2) // - 2*r-(16/2)
4*r-(2*r)+24/12+16/2 = 0
4*r-2*r+24/12+16/2 = 0
2*r+10 = 0 // - 10
2*r = -10 // : 2
r = -10/2
r = -5
r = -5
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