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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/5 = (a-7.46)/a // - (a-7.46)/a
3/5-((a-7.46)/a) = 0
(-1*(a-7.46))/a+3/5 = 0
(-1*5*(a-7.46))/(5*a)+(3*a)/(5*a) = 0
3*a-1*5*(a-7.46) = 0
37.3-2*a = 0
(37.3-2*a)/(5*a) = 0
(37.3-2*a)/(5*a) = 0 // * 5*a
37.3-2*a = 0
37.3-2*a = 0 // - 37.3
-2*a = -37.3 // : -2
a = -37.3/(-2)
a = 18.65
a = 18.65
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