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x in (-oo:+oo)
9*(x/12) = 40000 // - 40000
9*(x/12)-40000 = 0
3/4*x-40000 = 0 // + 40000
3/4*x = 40000 // : 3/4
x = 40000/3/4
x = 160000/3
x = 160000/3
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