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x in (-oo:+oo)
(9/20)*x = 55000*(11/20) // - 55000*(11/20)
(9/20)*x-(55000*(11/20)) = 0
(9/20)*x-30250 = 0
9/20*x-30250 = 0 // + 30250
9/20*x = 30250 // : 9/20
x = 30250/9/20
x = 605000/9
x = 605000/9
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