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a in (-oo:+oo)
((5*a)/5)*a-15 = 0
1*a^2 = 15 // : 1
a^2 = 15
a^2 = 15 // ^ 1/2
abs(a) = 15^(1/2)
a = 15^(1/2) or a = -15^(1/2)
a in { 15^(1/2), -15^(1/2) }
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