Related Post: X 2 )( X 1 )( 3x 7 0 X 7 X 5 3x 1 2 0 X 7 X 5 3x 1 2 ≥ 0 X 2 )( 2x 1 )( 3x 7 = 0 X 2 )( X 1 )( 3x 7 ≤ 0 X 2 )( 2x 1 )( 3x 7 ≥ 0 X+1 -5(7-2x)