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r in (-oo:+oo)
(-2/3)*r+2*r = (6/5)*r+12/5 // - (6/5)*r+12/5
(-2/3)*r+2*r-((6/5)*r)-(12/5) = 0
(-2/3)*r+2*r+(-6/5)*r-12/5 = 0
2/15*r-12/5 = 0 // + 12/5
2/15*r = 12/5 // : 2/15
r = 12/5/2/15
r = 18
r = 18
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