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r in (-oo:+oo)
(5/6)*(12*r-6) = 0
5/6*(12*r-6) = 0
( 12*r-6 )
12*r-6 = 0 // + 6
12*r = 6 // : 12
r = 6/12
r = 1/2
( 5/6 )
5/6 = 0
r belongs to the empty set
r = 1/2
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