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8*(-3/2)^2-(2*(5/4))-15 = 0
8*(3/2)^2-(2*(5/4))-15 = 0
9/4*8-(2*(5/4))-15 = 0
18-(2*(5/4))-15 = 0
18-(5/4*2)-15 = 0
18-15-5/2 = 0
31/2-15 = 0
1/2 = 0
L <> R
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