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x in (-oo:+oo)
((37*x)/3)*x = 420 // - 420
((37*x)/3)*x-420 = 0
37/3*x^2 = 420 // : 37/3
x^2 = 1260/37
x^2 = 1260/37 // ^ 1/2
abs(x) = (1260/37)^(1/2)
x = (1260/37)^(1/2) or x = -(1260/37)^(1/2)
x in { (1260/37)^(1/2), -(1260/37)^(1/2) }
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