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x in (-oo:+oo)
0.2 = (1/50000)*((200-x)/200) // - (1/50000)*((200-x)/200)
0.2-((1/50000)*((200-x)/200)) = 0
(-1/10000000)*(200-x)+0.2 = 0
0.2-1/10000000*(200-x) = 0
0.2-1/10000000*(200-x) = 0
1/10000000*x+0.19998 = 0
1/10000000*x+0.19998 = 0
1/10000000*x+0.19998 = 0 // - 0.19998
1/10000000*x = -0.19998 // : 1/10000000
x = -0.19998/1/10000000
x = -1999800
x = -1999800
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