Answer :

when you have an opperation as:

[tex]-a+(-b)[/tex]

You have to use the next statments:

[tex]+(+b)=+b[/tex][tex]+(-b)=-b[/tex][tex]-(-b)=+b[/tex]

You can follow the next image:

Then the answer will be:

[tex]-8+(-4)=-8-4=-12[/tex]

The result is - 12

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