Subtract $5 x^{2} - 4 y^{2} + 6 y - 3$ from $7 x^{2} - 4 x y + 8 y^{2} + 5 x - 3 y$ .

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Solution

Writing the three expressions in separate rows, with like terms one below the other, we have
Subtracting the like terms we get,

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