to adjust your incorrect symbols this is what your asking, Z = -9%(8+1)19, which equals 19 since any negative percent is equal to 0 for anything it is multiplied by and it's self. When a variable is unknown you can make it '1', In this equation it does not change much since it's equal to 0 so we never have to find "a" in the equation, Elementary.

What now

Done

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Yes it does.