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R in (-oo:+oo)
-64 = (4/3)*R // - (4/3)*R
-((4/3)*R)-64 = 0
(-4/3)*R-64 = 0
-4/3*R-64 = 0 // + 64
-4/3*R = 64 // : -4/3
R = 64/(-4/3)
R = -48
R = -48
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