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r in (-oo:+oo)
(-2*r)/8 = 30/24 // - 30/24
(-2*r)/8-(30/24) = 0
(-2*r)/8-5/4 = 0
-1/4*r-5/4 = 0 // + 5/4
-1/4*r = 5/4 // : -1/4
r = 5/4/(-1/4)
r = -5
r = -5
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