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r in (-oo:+oo)
(6/2)*(r+2) = 16/2 // - 16/2
(6/2)*(r+2)-(16/2) = 0
(6/2)*(r+2)-8 = 0
3*(r+2)-8 = 0
3*(r+2)-8 = 0
3*r-2 = 0
3*r-2 = 0
3*r-2 = 0 // + 2
3*r = 2 // : 3
r = 2/3
r = 2/3
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