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r in (-oo:+oo)
-12 = (6/5)*r // - (6/5)*r
-((6/5)*r)-12 = 0
(-6/5)*r-12 = 0
-6/5*r-12 = 0 // + 12
-6/5*r = 12 // : -6/5
r = 12/(-6/5)
r = -10
r = -10
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