7.若代数式$\frac{{x}^{2}}{5x+2}$的值是负数,则x的取值范围是( )
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| A. | x$<-\frac{5}{2}$ | B. | x$<-\frac{2}{5}$ | C. | x$>-\frac{5}{2}$ | D. | x$>-\frac{2}{5}$ |