# Arithmetic Operation $$\otimes$$

Algebra Level 2

An arithmetic operation $$\otimes$$ is defined as $$A \otimes B=AB-(A+B)$$. If $P=8x, Q=x^2+3x+2,$ what is the sum of all the coefficients of the polynomial in $$x$$ $(P+Q) \otimes P-(P-2Q) \otimes P?$

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