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D( x )
0.1-(x/50) = 0
0.1-(x/50) = 0
0.1-(x/50) = 0
0.1-1/50*x = 0 // - 0.1
-1/50*x = -0.1 // : -1/50
x = -0.1/(-1/50)
x = 5
x in (-oo:5) U (5:+oo)
10 = (x/30)/(0.1-(x/50)) // - (x/30)/(0.1-(x/50))
10-((x/30)/(0.1-(x/50))) = 0
(-1*1/30*x)/(0.1-1/50*x)+10 = 0
(-1*1/30*x)/(0.1-1/50*x)+(10*(0.1-1/50*x))/(0.1-1/50*x) = 0
10*(0.1-1/50*x)-1*1/30*x = 0
1-7/30*x = 0
(1-7/30*x)/(0.1-1/50*x) = 0
(1-7/30*x)/(0.1-1/50*x) = 0 // * 0.1-1/50*x
1-7/30*x = 0
1-7/30*x = 0 // - 1
-7/30*x = -1 // : -7/30
x = -1/(-7/30)
x = 30/7
x = 30/7
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