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3a + 6 + 4a + 10
7a + 16
b. -2(a + 2) - 2(2a+5)
-2a - 4 -4a - 10
-6a - 14
c. -2(-a² ) -2(2a - 5)
2a² - 4a - 10
d. 2a(a + b + c)