5*3^x−7=2^(x+3) I found myself stuck at x=log_3((2^(x+3)+7)/5) Help

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

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