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r in (-oo:+oo)
60*((5/12)*r-(4/15)) = 0
60*((5/12)*r-4/15) = 0
60*(5/12*r-4/15) = 0
( 5/12*r-4/15 )
5/12*r-4/15 = 0 // + 4/15
5/12*r = 4/15 // : 5/12
r = 4/15/5/12
r = 16/25
( 60 )
60 = 0
r belongs to the empty set
r = 16/25
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