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x in (-oo:+oo)
x/165000 = (x-120000)/115000 // - (x-120000)/115000
x/165000-((x-120000)/115000) = 0
(-1*(x-120000))/115000+x/165000 = 0
(-1*165000*(x-120000))/(115000*165000)+(115000*x)/(115000*165000) = 0
115000*x-1*165000*(x-120000) = 0
19800000000-50000*x = 0
(19800000000-50000*x)/(115000*165000) = 0
(19800000000-50000*x)/(115000*165000) = 0 // * 115000*165000
19800000000-50000*x = 0
19800000000-50000*x = 0 // - 19800000000
-50000*x = -19800000000 // : -50000
x = -19800000000/(-50000)
x = 396000
x = 396000
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