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3x*(2x-5)-(3x-4)*(2x-9)=204
We move all terms to the left:
3x*(2x-5)-(3x-4)*(2x-9)-(204)=0
We multiply parentheses
6x^2-15x-(3x-4)*(2x-9)-204=0
We move all terms containing x to the left, all other terms to the right
6x^2-15x-(3x-4)*(2x-9)=204
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