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b) 4x - 2y - 6x + 2y = -2x
c) 2a + 7(b-a) = 2a +7b - 7a = -5a + 7b
d) -3(k-p)+ 3p = -3k + 3p + 3p = -3k +6p
e) 9x² - 9y² + 3x² - 5y² + 7 = 12x² - 14y² + 7
f) -5(x+y) - 6(y-x) = -5x - 5y - 6y + 6x = x - 11y
b.-2x
c.-5a+7b
d.-3k + 6p
e.12x²-14y²+7
f.-11y