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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a-48 = (48/7)*a // - (48/7)*a
8/a-((48/7)*a)-48 = 0
(-48/7)*a+8/a-48 = 0
8*a^-1-48/7*a^1-48*a^0 = 0
(8*a^0-48/7*a^2-48*a^1)/(a^1) = 0 // * a^2
a^1*(8*a^0-48/7*a^2-48*a^1) = 0
a^1
(-48/7)*a^2-48*a+8 = 0
(-48/7)*a^2-48*a+8 = 0
DELTA = (-48)^2-(4*8*(-48/7))
DELTA = 17664/7
DELTA > 0
a = ((17664/7)^(1/2)+48)/(2*(-48/7)) or a = (48-(17664/7)^(1/2))/(2*(-48/7))
a = -7/96*((17664/7)^(1/2)+48) or a = -7/96*(48-(17664/7)^(1/2))
a in { -7/96*((17664/7)^(1/2)+48), -7/96*(48-(17664/7)^(1/2))}
a in { -7/96*((17664/7)^(1/2)+48), -7/96*(48-(17664/7)^(1/2)) }
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