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(x+2)(3x+4)(3x+7)(x+3)=2400
We move all terms to the left:
(x+2)(3x+4)(3x+7)(x+3)-(2400)=0
We multiply parentheses ..
(+3x^2+4x+6x+8)(3x+7)(x+3)-2400=0
We multiply parentheses ..
(+3x^2+4x+6x+8)(+3x^2+9x+7x+21)-2400=0
We move all terms containing x to the left, all other terms to the right
(+3x^2+4x+6x+8)(+3x^2+9x+7x+21)=2400
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