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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/a-(a/7) = 6 // - 6
9/a-(a/7)-6 = 0
9*a^-1-1/7*a^1-6*a^0 = 0
(9*a^0-1/7*a^2-6*a^1)/(a^1) = 0 // * a^2
a^1*(9*a^0-1/7*a^2-6*a^1) = 0
a^1
(-1/7)*a^2-6*a+9 = 0
(-1/7)*a^2-6*a+9 = 0
DELTA = (-6)^2-(4*9*(-1/7))
DELTA = 288/7
DELTA > 0
a = ((288/7)^(1/2)+6)/(2*(-1/7)) or a = (6-(288/7)^(1/2))/(2*(-1/7))
a = -7/2*((288/7)^(1/2)+6) or a = -7/2*(6-(288/7)^(1/2))
a in { -7/2*((288/7)^(1/2)+6), -7/2*(6-(288/7)^(1/2))}
a in { -7/2*((288/7)^(1/2)+6), -7/2*(6-(288/7)^(1/2)) }
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