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x in (-oo:+oo)
X/265000 = (x-280000)/185000 // - (x-280000)/185000
X/265000-((x-280000)/185000) = 0
(-1*(x-280000))/185000+X/265000 = 0
(-1*265000*(x-280000))/(185000*265000)+(185000*X)/(185000*265000) = 0
185000*X-1*265000*(x-280000) = 0
185000*X-265000*x+74200000000 = 0
(185000*X-265000*x+74200000000)/(185000*265000) = 0
(185000*X-265000*x+74200000000)/(185000*265000) = 0 // * 185000*265000
185000*X-265000*x+74200000000 = 0
185000*X-265000*x+74200000000 = 0 // - 185000*X+74200000000
-265000*x = -(185000*X+74200000000) // : -265000
x = (-(185000*X+74200000000))/(-265000)
x = (185000*X+74200000000)/265000
x = (185000*X+74200000000)/265000
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