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x in (-oo:+oo)
(((3*x)/(-21))*x)/32 = -7/6 // + -7/6
(((3*x)/(-21))*x)/32-(-7/6) = 0
(((3*x)/(-21))*x)/32+7/6 = 0
-1/224*x^2 = -7/6 // : -1/224
x^2 = 784/3
x^2 = 784/3 // ^ 1/2
abs(x) = (784/3)^(1/2)
x = (784/3)^(1/2) or x = -(784/3)^(1/2)
x in { (784/3)^(1/2), -(784/3)^(1/2) }
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