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x in (-oo:+oo)
2^3*x = 0.25*(1/(2^2))^3*x-1 // - 0.25*(1/(2^2))^3*x-1
2^3*x-(0.25*(1/(2^2))^3*x)+1 = 0
2^3*x-0.25*(1/(2^2))^3*x+1 = 0
7.99609375*x+1 = 0 // - 1
7.99609375*x = -1 // : 7.99609375
x = -1/7.99609375
x = -0.12506106
x = -0.12506106
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