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r in (-oo:+oo)
(1/2)*(4*r+4)-r-8 = 0
1/2*(4*r+4)-r-8 = 0
1/2*(4*r+4)-r-8 = 0
r-8+2 = 0
r-6 = 0
r-6 = 0
r-6 = 0 // + 6
r = 6
r = 6
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