How many real solutions does the equation ${x^7} + 14{x^5} + 16{x^3} + 30x - 560 = 0$ have?

Question

How many real solutions does the equation
${x^7} + 14{x^5} + 16{x^3} + 30x - 560 = 0$ have?

$7$

$1$

$3$

$5$

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