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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a-2 = (12/7)*a // - (12/7)*a
2/a-((12/7)*a)-2 = 0
(-12/7)*a+2/a-2 = 0
2*a^-1-12/7*a^1-2*a^0 = 0
(2*a^0-12/7*a^2-2*a^1)/(a^1) = 0 // * a^2
a^1*(2*a^0-12/7*a^2-2*a^1) = 0
a^1
(-12/7)*a^2-2*a+2 = 0
(-12/7)*a^2-2*a+2 = 0
DELTA = (-2)^2-(2*4*(-12/7))
DELTA = 124/7
DELTA > 0
a = ((124/7)^(1/2)+2)/(2*(-12/7)) or a = (2-(124/7)^(1/2))/(2*(-12/7))
a = -7/24*((124/7)^(1/2)+2) or a = -7/24*(2-(124/7)^(1/2))
a in { -7/24*((124/7)^(1/2)+2), -7/24*(2-(124/7)^(1/2))}
a in { -7/24*((124/7)^(1/2)+2), -7/24*(2-(124/7)^(1/2)) }
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