Subtract $- 3 x + 8 y$ from $- 7 x - 10 y .$

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Solution

We need to subtract $- 3 x + 8 y$ from $- 7 x - 10 y .$

As per given condition, we have
$- 7 x - 10 y - (- 3 x + 8 y) = - 7 x - 10 y + 3 x - 8 y$
$= (- 7 x + 3 x) + (- 10 y - 8 y)$
$= - 4 x - 18 y$

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