f(x)=5x/x²-7
f'(x) =(5(x²-7)-2x*5x)/(x²-7)²=(5x²-35-10x²)/(x²-7)²=(-5x²-35)/(x²-7)²
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f(x)=5x/x²-7
f'(x) =(5(x²-7)-2x*5x)/(x²-7)²=(5x²-35-10x²)/(x²-7)²=(-5x²-35)/(x²-7)²