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