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r in (-oo:+oo)
(-5/2)*r = 12 // - 12
(-5/2)*r-12 = 0
-5/2*r-12 = 0 // + 12
-5/2*r = 12 // : -5/2
r = 12/(-5/2)
r = -24/5
r = -24/5
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