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(2m+1)(2m-1)(m-2)-3(2m+1)(m-2)(m-1)+2(2m-1)(m-2)(m-1)=0
We multiply parentheses ..
(+4m^2-2m+2m-1)(m-2)-3(2m+1)(m-2)(m-1)+2(2m-1)(m-2)(m-1)=0
We multiply parentheses ..
(+4m^2-2m+2m-1)(m-2)-3(+2m^2-4m+m-2)(m-1)+2(2m-1)(m-2)(m-1)=0
We multiply parentheses ..
(+4m^2-2m+2m-1)(m-2)-3(+2m^2-4m+m-2)(m-1)+2(+2m^2-4m-1m+2)(m-1)=0
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