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a in (-oo:+oo)
(14*a^2)/5-((10*a^1)/5) = 0
(14*a^2)/5-2*a = 0
14/5*a^2-2*a = 0
DELTA = (-2)^2-(0*14/5*4)
DELTA = 4
DELTA > 0
a = (4^(1/2)+2)/(2*14/5) or a = (2-4^(1/2))/(2*14/5)
a = 5/7 or a = 0
a in { 0, 5/7 }
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