(x+3y)²- =(x+3y+2z)(x+3y-2z)

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(x+3y)²- =(x+3y+2z)(x+3y-2z)
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(x+3y)²- =(x+3y+2z)(x+3y-2z)
(x+3y)²- =(x+3y+2z)(x+3y-2z)

(x+3y)²- =(x+3y+2z)(x+3y-2z)
(x+3y)²-4z² =(x+3y+2z)(x+3y-2z)