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D( a )
a+7.46 = 0
a+7.46 = 0
a+7.46 = 0
a+7.46 = 0 // - 7.46
a = -7.46
a in (-oo:-7.46) U (-7.46:+oo)
3/5 = a/(a+7.46) // - a/(a+7.46)
3/5-(a/(a+7.46)) = 0
(-1*a)/(a+7.46)+3/5 = 0
(-1*5*a)/(5*(a+7.46))+(3*(a+7.46))/(5*(a+7.46)) = 0
3*(a+7.46)-1*5*a = 0
22.38-2*a = 0
(22.38-2*a)/(5*(a+7.46)) = 0
(22.38-2*a)/(5*(a+7.46)) = 0 // * 5*(a+7.46)
22.38-2*a = 0
22.38-2*a = 0 // - 22.38
-2*a = -22.38 // : -2
a = -22.38/(-2)
a = 11.19
a = 11.19
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