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A function f:[-5, 9] to R is defined as ...

A function `f:[-5, 9] to R` is defined as follows:
`f(x)={(6x+1" if" `-5lexlt2`), (5x^(2)-1" if "2lexlt6), (3x-4" if " 6lexle9):}`
Find `(2f(-2)-f(6))/(f(4)+f(-2))`

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