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r in (-oo:+oo)
3*r^2-((10/2)*r^2)+r+3*r-2 = 0
3*r^2-5*r^2+r+3*r-2 = 0
4*r-2*r^2-2 = 0
DELTA = 4^2-(-2*(-2)*4)
DELTA = 0
r = -4/(-2*2)
r = 1 or r = 1
r in { 1, 1 }
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