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3x2+5x2-9+x2+16= =3x2 + 5x2 - 9 + x2 + 16 =
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3x2+5x2-9+x2+16=

=3x2 + 5x2 - 9 + x2 + 16 =

User UnworthyToast
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3x^2+5x^2-9+x^2+16= \\ \\ 3x^2+5x^2+x^2-9+16= \boxed{ 9x^2+7} \\ \\
User Bdrelling
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