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1b. 12x^2-6
2a. 32x^2-39x
2b. -17a^2+9a
b. 12x^2-8
2. a. 2x^2-14 + 30x^2-25 = 32x^2-39
b. 4a^2-5a - 21a^2+14a = -17a^2+9a
c. -6c^2-6c + 7c^2+7c = c^2+c