Find the equation of the tangent line to the function y=−3x4−6\displaystyle {y}=-{3}{x}^{{4}}-{6} at the point (−2,−54)\displaystyle {\left(-{2},-{54}\right)}. No decimal values!

What is the derivative of y?  

The equation of the tangent line in y=mx+b\displaystyle {y}={m}{x}+{b} form:    

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