Question

5-(-5)+(-800)+710

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Apply rule $-(-a) = +a$
$=5+5+(-800)+710$

$5+5=10$
$=10+(-800)+710$

Apply rule $+(-a) = -a$
$=10-800+710$

$10-800=-790$
$=-790+710$

$-790+710=-80$
$=-80$

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