Let f and g be the function from the set of integers to itself, defined by f(x) = 2x + 1 and g(x) = 3x + 4. Then the composition of f and g is ________.
a) 6x + 9
b) 6x + 7
c) 6x + 6
d) 6x + 8

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a) 6x + 9
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