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a in (-oo:+oo)
((1*a)/5)*a = 10 // - 10
((1*a)/5)*a-10 = 0
(a/5)*a-10 = 0
1/5*a^2 = 10 // : 1/5
a^2 = 50
a^2 = 50 // ^ 1/2
abs(a) = 5*2^(1/2)
a = 5*2^(1/2) or a = -(5*2^(1/2))
a in { 5*2^(1/2), -(5*2^(1/2)) }
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