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(m*(2*m-5))/((m+6)*(2*m-3)) = -1
(2*m^2+5*m)/(2*m^2+9*m-18) = -1
77;20
m/(3-2*m)-((2*m+5)/(m+6));((m/(3-2*m))*(2*m+5))/(m+6)+1
28.26*(2/3) = 0
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