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x in (-oo:+oo)
(5*x+10*y)/200 = (10*x+5*y)/200+400 // - (10*x+5*y)/200+400
(5*x+10*y)/200-((10*x+5*y)/200)-400 = 0
(5*x+10*y)/200+(-1*(10*x+5*y))/200-400 = 0
(5*x+10*y)/200+(-1*(10*x+5*y))/200+(-400*200)/200 = 0
5*x-1*(10*x+5*y)+10*y-400*200 = 0
5*y-5*x-80000 = 0
(5*y-5*x-80000)/200 = 0
(5*y-5*x-80000)/200 = 0 // * 200
5*y-5*x-80000 = 0
5*y-5*x-80000 = 0 // - 5*y-80000
-5*x = -(5*y-80000) // : -5
x = (-(5*y-80000))/(-5)
x = (80000-(5*y))/(-5)
x = (80000-(5*y))/(-5)
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