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First things first, declare what you know!
Declare functions
f(x) = x + 7
g(x) = 7x
4f(2) - g(2)
Now let us plug in the variable values
4 * f(2)
4 * (2 + 7)
4 * 9
36
g(2)
7(2)
14
Plug&Play
36 - 14 = 22
After solving and simplifying we get!
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