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x^2-((1/4)*x^2)-750 = 0
x^2+(-1/4)*x^2-750 = 0
3/4*x^2 = 750 // : 3/4
x^2 = 1000
x^2 = 1000 // ^ 1/2
abs(x) = 10*10^(1/2)
x = 10*10^(1/2) or x = -(10*10^(1/2))
x in { 10*10^(1/2), -(10*10^(1/2)) }
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