(3x-y)(x+3y)+[3ysquare-3xsquare]
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(3x-y)(x+3y)+(3y²-3x²)
Let's simplify step-by-step.
=3x²+9xy+−xy+−3y²+3y²+−3x²
=3x²+9xy+−xy+−3y²+3y²+−3x²
=(3x2+−3x²)+(9xy+−xy)+(−3y²+3y²)
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