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x in (-oo:+oo)
(x+2580+2920)/3 = 3000 // - 3000
(x+2580+2920)/3-3000 = 0
(x+5500)/3-3000 = 0
(x+5500)/3+(-3000*3)/3 = 0
x-3000*3+5500 = 0
x-3500 = 0
(x-3500)/3 = 0
(x-3500)/3 = 0 // * 3
x-3500 = 0
x-3500 = 0 // + 3500
x = 3500
x = 3500
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