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\begin{array} { l } { \text { When } x = \frac { 1 } { 9 } \text { and } y = \frac { - 3 } { 4 } , \text { then the value of } } \\ { \text { xpression } 81 x ^ { 2 } + 16 y ^ { 2 } - 72 x y \text { is } } \end{array} |
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