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D( x )
15*a*x = 0
15*a*x = 0
15*a*x = 0
15*a*x = 0 // : 15*a
x = 0
x in (-oo:0) U (0:+oo)
(10*14*a)/(15*a*x) = 7/6 // - 7/6
(10*14*a)/(15*a*x)-(7/6) = 0
(10*14*a)/(15*a*x)-7/6 = 0
28/3*x^-1 = 7/6 // : 28/3
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
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