Product of binomials equation

Solve the equation $(x - 7) (x - 3) (x + 5) (x + 1) = 1680$ .

~12 minAnswer checked instantlypolynomial equationsrearrangement of factors

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. X. Miscellaneous Equations, Examples X.a, No. 17

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).