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Mathematics, 05.07.2019 03:30 MyaaaMoney

Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y^2-7x)=7x^2 -10y-2x. what error did marcus make?

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Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y^2-7x)=7x^2 -10y-2x. what error did marcus make?...
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