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D( a )
a^2 = 0
a = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
7/a+7/(a^2)-64+8 = 0
7*a^-1+7*a^-2-56 = 0
t_1 = a^-1
7*t_1^2+7*t_1^1-56 = 0
7*t_1^2+7*t_1-56 = 0
DELTA = 7^2-(-56*4*7)
DELTA = 1617
DELTA > 0
t_1 = (1617^(1/2)-7)/(2*7) or t_1 = (-1617^(1/2)-7)/(2*7)
t_1 = (7*33^(1/2)-7)/14 or t_1 = (-7*33^(1/2)-7)/14
t_1 = (-7*33^(1/2)-7)/14
a^-1-((-7*33^(1/2)-7)/14) = 0
1*a^-1 = (-7*33^(1/2)-7)/14 // : 1
a^-1 = (-7*33^(1/2)-7)/14
-1 < 0
1/(a^1) = (-7*33^(1/2)-7)/14 // * a^1
1 = ((-7*33^(1/2)-7)/14)*a^1 // : (-7*33^(1/2)-7)/14
14*(-7*33^(1/2)-7)^-1 = a^1
a = 14*(-7*33^(1/2)-7)^-1
t_1 = (7*33^(1/2)-7)/14
a^-1-((7*33^(1/2)-7)/14) = 0
1*a^-1 = (7*33^(1/2)-7)/14 // : 1
a^-1 = (7*33^(1/2)-7)/14
-1 < 0
1/(a^1) = (7*33^(1/2)-7)/14 // * a^1
1 = ((7*33^(1/2)-7)/14)*a^1 // : (7*33^(1/2)-7)/14
14*(7*33^(1/2)-7)^-1 = a^1
a = 14*(7*33^(1/2)-7)^-1
a in { 14*(-7*33^(1/2)-7)^-1, 14*(7*33^(1/2)-7)^-1 }
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