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r in (-oo:+oo)
2*r+2/4 = 4*r-(12/4) // - 4*r-(12/4)
2*r-(4*r)+2/4+12/4 = 0
2*r-4*r+2/4+12/4 = 0
7/2-2*r = 0 // - 7/2
-2*r = -7/2 // : -2
r = -7/2/(-2)
r = 7/4
r = 7/4
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