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**[Help] with Numbering System "Digital Circuit"**

Hello Guys ..

iam having an exam on digital circuits and i try to work on some problems about numbering systems

and i found this problems but i couldn't solve it ..

i said that (x-3)(x-6)=x^2-11x+22

then i said that

x^2-9x+18=x^2-11x+22

so 2x=4 and x=2 but i didn't know what to do after that ..so please help me

Thx Guys !!