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r in (-oo:+oo)
(-2/3)*r = (5/6)*r-36 // - (5/6)*r-36
(-2/3)*r-((5/6)*r)+36 = 0
(-2/3)*r+(-5/6)*r+36 = 0
36-3/2*r = 0 // - 36
-3/2*r = -36 // : -3/2
r = -36/(-3/2)
r = 24
r = 24
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