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x in (-oo:+oo)
x-((3000/2)*x) = 13000 // - 13000
x-((3000/2)*x)-13000 = 0
x-1500*x-13000 = 0
-1499*x-13000 = 0 // + 13000
-1499*x = 13000 // : -1499
x = 13000/(-1499)
x = -13000/1499
x = -13000/1499
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