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x in (-oo:+oo)
x-(x/10) = 12000 // - 12000
x-(x/10)-12000 = 0
9/10*x-12000 = 0 // + 12000
9/10*x = 12000 // : 9/10
x = 12000/9/10
x = 40000/3
x = 40000/3
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