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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/180+1/140 = 12/x // - 12/x
1/180-(12/x)+1/140 = 0
1/180-12*x^-1+1/140 = 0
-12*x^-1 = -4/315 // : -12
x^-1 = 1/945
-1 < 0
1/(x^1) = 1/945 // * x^1
1 = 1/945*x^1 // : 1/945
945 = x^1
x = 945
x = 945
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