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D( a )
7*a = 0
a = 0
7*a = 0
7*a = 0
7*a = 0 // : 7
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10/a-60 = 60/(7*a) // - 60/(7*a)
10/a-(60/(7*a))-60 = 0
10/a+(-60/7)*a^-1-60 = 0
10/7*a^-1 = 60 // : 10/7
a^-1 = 42
-1 < 0
1/(a^1) = 42 // * a^1
1 = 42*a^1 // : 42
1/42 = a^1
a = 1/42
a = 1/42
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