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| 1. |
\left. \begin{array} { l } { \text { Subtract the sum of } - 7 a ^ { 2 } - 3 a b + 4 b ^ { 2 } \text { and } } \\ { a ^ { 2 } \text { Tab from the sum of } 4 a ^ { 2 } - b ^ { 2 } \text { and } - 7 a ^ { 2 } + 7 b a } \end{array} \right. |
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