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x in (-oo:+oo)
0 = (-4000/3)*x+22000 // - (-4000/3)*x+22000
0-((-4000/3)*x)-22000 = 0
(4000/3)*x-22000 = 0
4000/3*x-22000 = 0 // + 22000
4000/3*x = 22000 // : 4000/3
x = 22000/4000/3
x = 33/2
x = 33/2
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