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x in (-oo:+oo)
((2*(2/3)*x)/3)*x-7 = 47 // - 47
((2*(2/3)*x)/3)*x-47-7 = 0
4/9*x^2 = 54 // : 4/9
x^2 = 243/2
x^2 = 243/2 // ^ 1/2
abs(x) = (243/2)^(1/2)
x = (243/2)^(1/2) or x = -(243/2)^(1/2)
x in { (243/2)^(1/2), -(243/2)^(1/2) }
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