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7. (5z+3) -(2z - 7) = 5z + 3 - 2z + 7 = 3z + 10
8. (x-y) -(6x+4) = x - y - 6x - 4 = -5x - y -4
9. a. 8a
b. 12a
c. a+b+c+d+a-c+b-d = 2a + 2b