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r in (-oo:+oo)
(1/2)*r^2-10 = (3/2)*r^2 // - (3/2)*r^2
(1/2)*r^2-((3/2)*r^2)-10 = 0
(1/2)*r^2+(-3/2)*r^2-10 = 0
-1*r^2 = 10 // : -1
r^2 = -10
r belongs to the empty set
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