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B) 10b-6b-5+3 = 4b - 2
C) -3c - 2 - (-8c) -3 =-3c + 8c -2 -3 = 5c -5
D) 5x²-7x²-9x²+x-4 = -11x² + x - 4
E) 10y+9y+1-(-y)²+6+9 = 19y + y² + 1 + 6 + 9= 19y + y² + 16
F) 10a² - 3a² + 2 - 4a² + 6a -7= 10a²-3a²-4a²+6a+2-7 =3a² + 6a - 5
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