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\left. \begin{array} { l } { ( i i ) 4 a + 5 a b - 7 \text { from } 3 a - 2 a b - 6 } \\ { ( i v ) 7 a ^ { 3 } b - 4 a ^ { 2 } b ^ { 2 } + 9 \text { from } 3 a ^ { 3 } b + 2 a ^ { 2 } b ^ { 2 } + 7 } \end{array} \right. |
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Answer» you want subtraction of them |
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