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-3*4-((4/2)*(-3)^2) = 0
-((4/2)*(-3)^2)-12 = 0
-(2*(-3)^2)-12 = 0
-(2*3^2)-12 = 0
-(2*9)-12 = 0
-18-12 = 0
-(12+18) = 0
-30 = 0
L <> R
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