Integrating Even and Odd Functions

Suppose that f(x)=f(x)f\left(-x\right)=f\left(x\right) and 055f(x)dx=9\int_0^55\cdot f\left(x\right)dx=9. Find 553f(x) dx\int_{-5}^53\cdot f\left(x\right)\ dx.
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