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Mathematics, 28.01.2020 22:55 abc236

1. -2x + 4x^2 - 7 - x^2 + 7 - 8x

2. 7ab - bc - 4ab - 5bc

3. 3x^2 - 5x + 7 + 2x^2 + 3x - 9

4. 3r + 2z + 9t + 4r - 5s + t

5. -5xy + 7wz - xy - 5wz

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1. -2x + 4x^2 - 7 - x^2 + 7 - 8x

2. 7ab - bc - 4ab - 5bc

3. 3x^2 - 5x + 7 +...
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