What are the solutions to the equation

4x+21 = - (1/3) ^x+4 + 6

a. x=-6 and x=-4

b. x = - 6 and x = - 5.75

c. x=3 and x = - 5

d. x = - 6 and x = 3

What times what is 15 but also adds up to a total of 8?

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