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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*120)/x-2 = 80 // - 80
(10*120)/x-80-2 = 0
1200*x^-1 = 82 // : 1200
x^-1 = 41/600
-1 < 0
1/(x^1) = 41/600 // * x^1
1 = 41/600*x^1 // : 41/600
600/41 = x^1
x = 600/41
x = 600/41
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