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