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a in (-oo:+oo)
1900 = ((1/2)*a^10)/2 // - ((1/2)*a^10)/2
1900-(((1/2)*a^10)/2) = 0
(-1/4)*a^10+1900 = 0
-1/4*a^10 = -1900 // : -1/4
a^10 = 7600
a^10 = 7600 // ^ 1/10
abs(a) = 7600^(1/10)
a = 7600^(1/10) or a = -7600^(1/10)
a in { 7600^(1/10), -7600^(1/10) }
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