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Mathematics, 14.10.2019 01:30 hectorgonzalejr333

Lucia finds that (3x^2+3x+5) + (7x^2-9x+8) = 10x^2-12x+13. what error did lucia make?

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Lucia finds that (3x^2+3x+5) + (7x^2-9x+8) = 10x^2-12x+13. what error did lucia make?...
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