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X in (-oo:+oo)
200000*(X/3)+150000*X = 0.08*120000*(500-(X/3))+0.08*90000*(500-X)+120000*(X/3)+90000*X+150000*(X/3)+15*X+11000000 // - 0.08*120000*(500-(X/3))+0.08*90000*(500-X)+120000*(X/3)+90000*X+150000*(X/3)+15*X+11000000
200000*(X/3)-(0.08*120000*(500-(X/3)))-(0.08*90000*(500-X))+150000*X-(120000*(X/3))-(90000*X)-(150000*(X/3))-(15*X)-11000000 = 0
200000*(X/3)-9600*(500-(X/3))-7200*(500-X)+150000*X-40000*X-90000*X-50000*X-15*X-11000000 = 0
(200000*X)/3-9600*(500-1/3*X)-7200*(500-X)+150000*X-40000*X-90000*X-50000*X-15*X-11000000 = 0
(-9600*3*(500-1/3*X))/3+(-7200*3*(500-X))/3+(200000*X)/3+(3*150000*X)/3+(-40000*3*X)/3+(-90000*3*X)/3+(-50000*3*X)/3+(-15*3*X)/3+(-11000000*3)/3 = 0
200000*X-9600*3*(500-1/3*X)-7200*3*(500-X)+3*150000*X-40000*3*X-90000*3*X-50000*3*X-15*3*X-11000000*3 = 0
31200*X+200000*X+450000*X-120000*X-270000*X-150000*X-45*X-33000000-25200000 = 0
231200*X+450000*X-120000*X-270000*X-150000*X-45*X-33000000-25200000 = 0
681200*X-120000*X-270000*X-150000*X-45*X-33000000-25200000 = 0
561200*X-270000*X-150000*X-45*X-33000000-25200000 = 0
291200*X-150000*X-45*X-33000000-25200000 = 0
141200*X-45*X-33000000-25200000 = 0
141155*X-33000000-25200000 = 0
141155*X-58200000 = 0
(141155*X-58200000)/3 = 0
(141155*X-58200000)/3 = 0 // * 3
141155*X-58200000 = 0
141155*X-58200000 = 0 // + 58200000
141155*X = 58200000 // : 141155
X = 58200000/141155
X = 11640000/28231
X = 11640000/28231
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