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x in (-oo:+oo)
((1200000-x)/2)/1200000 = 0.1 // - 0.1
((1200000-x)/2)/1200000-0.1 = 0
(1200000-x)/(2*1200000)-0.1 = 0
(1200000-x)/(2*1200000)+(-0.1*2*1200000)/(2*1200000) = 0
1200000-x-0.1*2*1200000 = 0
960000-x = 0
(960000-x)/(2*1200000) = 0
(960000-x)/(2*1200000) = 0 // * 2*1200000
960000-x = 0
960000-x = 0 // - 960000
-x = -960000 // * -1
x = 960000
x = 960000
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