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A = 2x + 3 - 4x + 6

A = 2x - 4x + 3 + 6

A = - 2x + 9

B = - 3a + 1/2 - 1/5 + 2a

B = - 3a + 2a + 1/2 - 1/5

B = - a + 5/10 - 2/10

B = - a + 3/10

C = 7x² - 21x + 6 - 2x - 9x²

C = 7x² - 9x² - 21x - 2x + 6

C = - 2x² - 23x + 6

D = a + b - 12a² + 2b² - 6a + 5b - 21

D = - 12a² + 2b² + a - 6a + b + 5b - 21

D = - 12a² + 2b² - 5a + 6b - 21

E = 8x - 14 + 9x² - 6x² - 13x + 25

E = 9x² - 6x² + 8x - 13x - 14 + 25

E = 3x² - 5x + 11

F = - 3x² + 2x - 1 - 5x² + 3 + 6x

F = - 3x² - 5x² + 2x + 6x - 1 + 3

F = - 8x² + 8x + 2

G = - 4x² - 1/3 + 2x + 1/6 - 5x + 4x²

G = - 4x²+ 4x² + 2x - 5x - 1/3 + 1/6

G = - 3x - 2/6 + 1/6

G = - 3x + 1/6.