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r in (-oo:+oo)
r-((6/4)*r)-12 = 0
r+(-3/2)*r-12 = 0
-1/2*r-12 = 0 // + 12
-1/2*r = 12 // : -1/2
r = 12/(-1/2)
r = -24
r = -24
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