-108-(-112)+23+18

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-108-(-112)+23+18-108-(-112)+23+18-108-(-112)+23+18-108-(-112)+23+18=-108+112+23+18=4+23+18=45

-108-(-112)+23+18
-108-(-112)+23+18

-108-(-112)+23+18
-108-(-112)+23+18
=-108+112+23+18
=4+23+18
=45