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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/4-(a/a)+5 = 7/a // - 7/a
3/4-(7/a)-(a/a)+5 = 0
3/4-7*a^-1-1+5 = 0
-7*a^-1 = -19/4 // : -7
a^-1 = 19/28
-1 < 0
1/(a^1) = 19/28 // * a^1
1 = 19/28*a^1 // : 19/28
28/19 = a^1
a = 28/19
a = 28/19
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