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x in (-oo:+oo)
x/200 = (x-90)/150 // - (x-90)/150
x/200-((x-90)/150) = 0
(-1*(x-90))/150+x/200 = 0
(-1*200*(x-90))/(150*200)+(150*x)/(150*200) = 0
150*x-1*200*(x-90) = 0
18000-50*x = 0
(18000-50*x)/(150*200) = 0
(18000-50*x)/(150*200) = 0 // * 150*200
18000-50*x = 0
18000-50*x = 0 // - 18000
-50*x = -18000 // : -50
x = -18000/(-50)
x = 360
x = 360
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