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x in (-oo:+oo)
(x/2)*x-6 = 0.875 // - 0.875
(x/2)*x-6-0.875 = 0
1/2*x^2 = 6.875 // : 1/2
x^2 = 13.75
x^2 = 13.75 // ^ 1/2
abs(x) = 13.75^(1/2)
x = 13.75^(1/2) or x = -13.75^(1/2)
x in { 13.75^(1/2), -13.75^(1/2) }
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