Find the sum of the following.
$- b - 4 a$ , $7 b - 6 a$ .

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Solution

$(- b - 4 a) + (7 b - 6 a) \Rightarrow (- b + 7 b) + (- 6 a - 4 a) [+ \times - = -] \Rightarrow 6 b + (o a) \Rightarrow 6 b - 10 a A n s .$

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