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What do you need to add to -9 to get 8?

Anonymous

∙ 12y ago

Updated: 8/20/2019

You need to add 17.

x+-9=8

Add nine to each side

x+-9=8

+9 +9

-9+9=0 so nine cancels out.

8+9=17 so now you have:

x=17

Now you have the value of x.

Wiki User

∙ 12y ago

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