If f(x)=x2−7xf(x)=x^{2}-7xf(x)=x2−7x and g(x)=x+3g(x)=x+3g(x)=x+3, then the minimum value of f(g(x))−3xf(g(x))-3xf(g(x))−3x is:
-20
-12
-15
-16
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