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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
-3.5/a = (1*(3/4))/1 // - (1*(3/4))/1
-3.5/a-((1*(3/4))/1) = 0
-3.5/a-3/4 = 0
-3.5*a^-1 = 3/4 // : -3.5
a^-1 = -0.21428571
-1 < 0
1/(a^1) = -0.21428571 // * a^1
1 = -0.21428571*a^1 // : -0.21428571
-4.66666676 = a^1
a = -4.66666676
a = -4.66666676
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