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b. 18 - 15 + 2y2 +y2 = 3 + 3y2
c. 9x - 8x + 6y -10y = x - 4 y
d. 6q2 + q2 - 8q - 2q = 7q2 - 10q
c. 9x + 6y - 10y - 8x = x - 4y