3X( X -5 ) - ( X -1 )( 2 +3X ) = 30 4/ (X+2)(X+3) - (X-2)(X+5) = 0

3/ - DE KIEM TRA TIET 21 DAI SO
DE KIEM TRA TIET 21 DAI SO

3/ 3x( x -5 ) - ( x -1 )( 2 +3x ) = 30 4/ (x+2)(x+3) - (x-2)(x+5) = 0