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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a-36 = (36/7)*a // - (36/7)*a
6/a-((36/7)*a)-36 = 0
(-36/7)*a+6/a-36 = 0
6*a^-1-36/7*a^1-36*a^0 = 0
(6*a^0-36/7*a^2-36*a^1)/(a^1) = 0 // * a^2
a^1*(6*a^0-36/7*a^2-36*a^1) = 0
a^1
(-36/7)*a^2-36*a+6 = 0
(-36/7)*a^2-36*a+6 = 0
DELTA = (-36)^2-(4*6*(-36/7))
DELTA = 9936/7
DELTA > 0
a = ((9936/7)^(1/2)+36)/(2*(-36/7)) or a = (36-(9936/7)^(1/2))/(2*(-36/7))
a = -7/72*((9936/7)^(1/2)+36) or a = -7/72*(36-(9936/7)^(1/2))
a in { -7/72*((9936/7)^(1/2)+36), -7/72*(36-(9936/7)^(1/2))}
a in { -7/72*((9936/7)^(1/2)+36), -7/72*(36-(9936/7)^(1/2)) }
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