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x(x+2)(x+4)(x+6)=9009
We move all terms to the left:
x(x+2)(x+4)(x+6)-(9009)=0
We multiply parentheses ..
x(+x^2+4x+2x+8)(x+6)-9009=0
We move all terms containing x to the left, all other terms to the right
x(+x^2+4x+2x+8)(x+6)=9009
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