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Help me with this please I don't understand it !

Help me with this please I don't understand it !-example-1
User Hiromi
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You would re-write a, b, and f, because when a problem has a double negative it is the same as adding them together. Like for example -8-(-9) you see how there is a double negative there? So it would be re-written as -8+9. 
User Nexar
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