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2.5 + 2x - 1 = 5 - 1 + 2x = 4 + 2x
3.3x - 6x + 4 = -3x + 4
4.8 + 3x - x - 6 = 8 - 6 + 3x - x = 2 + 2x
5.6 + 6x = 6 + 6x
6.3x + 3x - x = 5x
7.4x² - x = 4x² - x
8.5x² + 2x - 3 = 5x² + 2x - 3
9.2x³ - 3x - x² + 2x + 5= 2x³ -3x + 2x - x² + 5 = 2x³ - x - x² + 5