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B. 9x²+12y-12x²-14y = 9x²-11x²+12y-14y = 2x²+2y
2x + 5y - 18x = 10y
2x - 18x = 10y - 5y
-16x = 5y
B. -9x^2 + 12y - 12x^2 - 14y
-9x^2 + 12y - 12x^2 = 14y
-9x^2 - 12x^2 = 14y - 12y
-21x = 2y