2 answers
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1. (2x2 - 3x2) + (-4x + 3x) + (8 + 7) - 6x2 = -7x2 - x + 15
2. Rearranging terms: -2x2 - 6x + 8 + 1 = -2x2 - 6x + 9
3. Rearranging terms: -6x2 - x + 7 + 9 = -6x2 - x + 16, simplifying: -6x2 - x + 16
4. Rearranging terms: 2x2 - 6x2 + 9 = -4x2 + 9