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r in (-oo:+oo)
((1/5)*(3*r-4)^2)/5 = 0
(1/5*(3*r-4)^2)/5 = 0
( 1/5 )
1/5 = 0
r belongs to the empty set
( 3*r-4 )
3*r-4 = 0 // + 4
3*r = 4 // : 3
r = 4/3
r in { 4/3, 4/3 }
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