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    f(x) = px7 + qx3  + rx - 4 = x(px6 + qx2  + rx) - 4

    set A = px6 + qx2  + rx

    => f(x) = x(A) - 4

    with x = -7

    => f(-7) = -7(A) -  4 = 3       => A = -1

    with x = 7

    => f(7) = 7(A) - 4 = 7(-1) - 4 =11

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