СРОЧНО ПОМОГИТЕ !!! m^2/m-4n-16n^2-8mn/4n-m /дробь ^степень

m^2 / ( m - 4n ) - ( 16n^2 - 8mn ) / ( 4n - m ) = ( - m^2 - 16n^2 + 8mn ) / ( 4n - m ) = ( m^2 - 8mn + 16n^2 ) / ( m - 4n ) = ( m - 4n )^2 / ( m - 4n ) = m - 4n