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Four numbers, a, B, C and D, are arranged in two rows and two columns, and a vertical line is added on each side to mark them as ABCD. ABCD = ad BC is defined. The above marks are called second-order determinants 2X + 1 X-1 3 - 2 = 6 x=
From the known - 2 (2x + 1) - 3 (x-1) = 6
So 1-7x = 6
So x = - 5 / 7
RELATED INFORMATIONS
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