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x in (-oo:+oo)
(-4*x^7)/2 = 25/2 // - 25/2
(-4*x^7)/2-(25/2) = 0
(-4*x^7)/2-25/2 = 0
-2*x^7 = 25/2 // : -2
x^7 = -25/4
x^7 = -25/4 // ^ 1/7
x = -(25/4)^(1/7)
x = -(25/4)^(1/7)
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