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r in (-oo:+oo)
(-1/5)*r = 4.8 // - 4.8
(-1/5)*r-4.8 = 0
-1/5*r-4.8 = 0 // + 4.8
-1/5*r = 4.8 // : -1/5
r = 4.8/(-1/5)
r = -24
r = -24
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