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r in (-oo:+oo)
30 = (2*r)/3 // - (2*r)/3
30-((2*r)/3) = 0
(-2/3)*r+30 = 0
30-2/3*r = 0 // - 30
-2/3*r = -30 // : -2/3
r = -30/(-2/3)
r = 45
r = 45
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