Subtract $3 a b$ from $- 7 a b$

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Solution

Find the subtraction of $3 a b$ from $- 7 a b$
$- 7 a b - 3 a b = - 10 a b$ (Here $-, -$ get $+$ add for the final answer we take the sign of bigger number )
$∴$ The subtraction of $3 a b$ from $- 7 a b$ is $- 10 a b$

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