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x in (-oo:+oo)
484 = (((4*x)/2)*x)/2 // - (((4*x)/2)*x)/2
484-((((4*x)/2)*x)/2) = 0
484-x^2 = 0
-1*x^2 = -484 // : -1
x^2 = 484
x^2 = 484 // ^ 1/2
abs(x) = 22
x = 22 or x = -22
x in { 22, -22 }
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