There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ {x}^{7} + (3{x}^{5}){y}^{5} + 8{y}^{7} - 7\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = x^{7} + 3y^{5}x^{5} + 8y^{7} - 7\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( x^{7} + 3y^{5}x^{5} + 8y^{7} - 7\right)}{dx}\\=&7x^{6} + 3y^{5}*5x^{4} + 0 + 0\\=&7x^{6} + 15y^{5}x^{4}\\ \end{split}\end{equation} \]

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