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a in (-oo:+oo)
(5/8)*(3/8)*(40/100)*a*a = 350000 // - 350000
(5/8)*(3/8)*(40/100)*a*a-350000 = 0
3/32*a^2 = 350000 // : 3/32
a^2 = 11200000/3
a^2 = 11200000/3 // ^ 1/2
abs(a) = (11200000/3)^(1/2)
a = (11200000/3)^(1/2) or a = -(11200000/3)^(1/2)
a in { (11200000/3)^(1/2), -(11200000/3)^(1/2) }
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