Math

2^3 x 2^-4x 2^3x 2^-6

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23 x 2-4x 23x 2-6

If the base of the exponents are the same then you can simply add the exponents:

23 x 2-4x 23x 2-6=the base is "2" so

23+-4+3+-6

2-1+3+-6

2+2+-6

2-4