(9x²/-3x-y)+(y²/y+3x)
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(9x²/-3x-y)+(y²/y+3x)
(9x²/-3x-y)+(y²/y+3x)
(9x²/-3x-y)+(y²/y+3x)
(9x²/-3x-y)+(y²/y+3x)
=-9x²/(y+3x)+(y²/y+3x)
=(-9x²+y²)/(y+3x)
=(y+3x)(y-3x)/(y+3x)
=y-3x